Inventory Issues & Receipts tripling our valuation

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Hello,

We converted from Sage 50 to Sage 100 October of 2020. Sage 50 did not track our inventory by Lot Numbers, therefore when moving to Sage 100, we had to import the quantity on hand and perform an Inventory Issues and Receipts for each item so that we could issue out the inventory on hand and receipt it back in with correct count and assign lot number. This was advised by our Sage 100 Representative. However, the first of the year running the General Ledger and all financial statements, we see that in the 3-4 months since the conversion our inventory valuation has tripled. How do we keep this from happening in the future and how do we solve this now so that we are not paying taxes on the high valuation of inventory that has not tripled in that time? Our CPA does not know how to use Sage 100, only 50, so we are at a huge disadvantage! Any help would be appreciated.