Cant' change check numbers

I accidently printed some other forms on two check forms. So I got two more checks and tried to reprint them thinking I can enter in the new check numbers when the check number window comes up, which I know I have done before. However, this time when the check number window came up the old check number was still in the window and I couldn't change it to the new check number. We recently installed a new computer and had to download and install the MLS program.

I have the same issues, how do I let MLS know I have a bad check and need to advance the count ?

I had to reuse the two check documents and was only able to do that because nothing got printed on the actual checks themselves, but there is other stuff printed on the check stubs.