Need help with mismatch between transaction and holdings lot

I am trying to reconcile an investment account. The first transaction for a mutual fund I bought is showing up in my holdings with the wrong share balance, and it looks like it's automatically subtracting a certain amount from my cost basis, then recalculating the number of shares I bought based on a lower cost basis. I have deleted the transaction and re-entered it multiple times and it keeps changing the number of shares the I bought as listed on the lot in my holdings page. Has anyone seen this.