How can I adjust the RRSP income of $30,000.00 on my income summary when I only withdrew $10,000.00?

Each time I go back to adjust the RRSP income amount, TurboTax increases the RRSP income ... now it is at $40,000.00.

Verify if you have duplicate slips created in Turbo Tax, under the "Income" tab and "T-slips".

Double check your entries under the "Income" tab > "T-slips" and T4RSP. Make sure you do not have duplicate entries, if so "Delete".