I don't think it would have anything to do with Lot-Numbered Inventory necessarily. If you look up Cost of Sales Adjustments in SuiteAnswers, it should tell you what might have caused it. I'd also check out info on Intraday costing order.
My experience with those is usually it has something to do with back-dating transactions. If for instance today you put stuff back in inventory, but dated the transaction 8/1/2022, the system will recalc costing on everything after 8/1, which can cause some of the COGs Adjustments.