QB Issue Resolution:

that happens when you have sold to a negative on hand and later purchased some

when you sold to a negative on hand, QB used the old average cost to post to COGS and reduce inventory – then when you buy more, QB calculates a new average cost and compare the new to the old and if necessary makes an adjustment. that adjustment shows in the inventory and COGS accounts as a bill. It is a correct entry.

Resolution for Issue 'QuickBooks is automatically adjusting Inventory amount when I receive items, why is it doing this and how do I fix it?' available: Yes (Solved).
Source: Intuit Community forum.

QuickBooks is automatically adjusting Inventory amount when I receive items, why is it doing this and how do I fix it?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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