Hi,
If the same item on various invoices is difference in the OE-AR Clearing account, it sounds like there could be a category configuration issue, where one of the sales or cost of sales accounts in the Inventory Category table is pointing to the OE-AR clearing account.

This would effect the GL distribution by netting against the total invoice value for the source entry coming from OE.

Check your category code in Inventory for said item(s) and confirm that the GL account distributions for that item are correct, and revise as necessary.

Best,
Brian