Very High price in WA Type while confirmation/auto GR in production order

Dear Experts,

I am doing confirmation/auto GR on past dates (old posting date). In Fbl3n t-code, for the given GL, WA Type against production order showing very high prices. Wa type (WA for goods issues, transfer postings, other goods receipts). What is the reason behind it ? And T-code COGI is being processed automatically internally.

regards

Raheel