It'd be helpful if you can tell us what exactly is not matching.  Because of social distancing, we can't get too close to your mind to see what you're seeing.

Your client doesn't need to be subject to AMT for an AMT form to be produced with a number.  Some prefer to have that as part of their records regardless.  The AMT amounts are used to determine whether someone is subject to AMT, even if F.6251 is not required.