Suggested Ordering On Hand items keep reseting

Store 01942

Location is experiencing an issue where the on-hand quantities for a majority of their items are continually being reset after a truck order.

The store had a point where the POS sent data from 12/21/2020 and now on hand amounts are off.  Is there anyway to fix this?

select Inventory_qty, * from tbItemBalance with (nolock)
where entityid = 1050 and itemId =883
order by StartDate DESC