Stock unreserved quantities fix for in consistent stock moves
odoo 12 / 13 fix for in consistent stock moves try the solution for later versions and comment pls.

Thanks to  Julia van orsouw and ARM from odoo form for this solution.

1. debug mode
2. technical/server actions
3. create
4. action name: e.g. fix unreserved qty
5. model: ir.actions.server
6. action to do: "execute python code"
7. copy/paste the fix underneath the pre-existing code
8. "save"
9. "create contextual action"
10. refresh page
11. action/fix "fix unreserved qty"
12. wait for it to load
13. "remove contextual action"
14. action/delete

Here is the code for the server action

# Available variables:

#  - env: Odoo Environment on which the action is triggered

#  - model: Odoo Model of the record on which the action is triggered; is a void recordset

#  - record: record on which the action is triggered; may be void

#  - records: recordset of all records on which the action is triggered in multi-mode; may be void

#  - time, datetime, dateutil, timezone: useful Python libraries

#  - log: log(message, level='info'): logging function to record debug information in ir.logging table

#  - Warning: Warning Exception to use with raise

# To return an action, assign: action = {...}



# Available variables:

#  - env: Odoo Environment on which the action is triggered

#  - model: Odoo Model of the record on which the action is triggered; is a void recordset

#  - record: record on which the action is triggered; may be void

#  - records: recordset of all records on which the action is triggered in multi-mode; may be void

#  - time, datetime, dateutil, timezone: useful Python libraries

#  - log: log(message, level='info'): logging function to record debug information in ir.logging table

#  - Warning: Warning Exception to use with raise

# To return an action, assign: action = {...}


quants = env["stock.quant"].search([])

move_line_ids = []

warning = ""

for quant in quants:

    move_lines = env["stock.move.line"].search(

        [

            ("product_id", "=", quant.product_id.id),

            ("location_id", "=", quant.location_id.id),

            ("lot_id", "=", quant.lot_id.id),

            ("package_id", "=", quant.package_id.id),

            ("owner_id", "=", quant.owner_id.id),

            ("product_qty", "!=", 0),

        ]

    )

    move_line_ids += move_lines.ids

    reserved_on_move_lines = sum(move_lines.mapped("product_qty"))

    move_line_str = str.join(

        ", ", [str(move_line_id) for move_line_id in move_lines.ids]

    )


    if quant.location_id.should_bypass_reservation():

        # If a quant is in a location that should bypass the reservation, its `reserved_quantity` field

        # should be 0.

        if quant.reserved_quantity != 0:

            quant.write({"reserved_quantity": 0})

    else:

        # If a quant is in a reservable location, its `reserved_quantity` should be exactly the sum

        # of the `product_qty` of all the partially_available / assigned move lines with the same

        # characteristics.

        if quant.reserved_quantity == 0:

            if move_lines:

                move_lines.with_context(bypass_reservation_update=True).write(

                    {"product_uom_qty": 0}

                )

        elif quant.reserved_quantity < 0:

            quant.write({"reserved_quantity": 0})

            if move_lines:

                move_lines.with_context(bypass_reservation_update=True).write(

                    {"product_uom_qty": 0}

                )

        else:

            if reserved_on_move_lines != quant.reserved_quantity:

                move_lines.with_context(bypass_reservation_update=True).write(

                    {"product_uom_qty": 0}

                )

                quant.write({"reserved_quantity": 0})

            else:

                if any(move_line.product_qty < 0 for move_line in move_lines):

                    move_lines.with_context(bypass_reservation_update=True).write(

                        {"product_uom_qty": 0}

                    )

                    quant.write({"reserved_quantity": 0})


move_lines = env["stock.move.line"].search(

    [

        ("product_id.type", "=", "product"),

        ("product_qty", "!=", 0),

        ("id", "not in", move_line_ids),

    ]

)


move_lines_to_unreserve = []


for move_line in move_lines:

    if not move_line.location_id.should_bypass_reservation():

        move_lines_to_unreserve.append(move_line.id)


if len(move_lines_to_unreserve) > 1:

    env.cr.execute(

        """ 

            UPDATE stock_move_line SET product_uom_qty = 0, product_qty = 0 WHERE id in %s ;

        """

        % (tuple(move_lines_to_unreserve),)

    )

elif len(move_lines_to_unreserve) == 1:

    env.cr.execute(

        """ 

        UPDATE stock_move_line SET product_uom_qty = 0, product_qty = 0 WHERE id = %s ;

        """

        % (move_lines_to_unreserve[0])

    )




update odoo code from github
or update any repo cloned from github