I have found in the past that if you switch to a BIN price when creating your listing, then go to Create My Listing so it brings you to the confirmation screen; click Edit My Listing (which brings you back to the listing generator) and switch it back to an Auction price and put in your appropriate amount and then create the listing if seems to resolve itself.

If you're originally creating a BIN listing, do the opposite (change to Auction and switch back to BIN).