Okay, I think I figured it out.  You haven't been very specific about where you're making entries, but I believe this one is the problem.  You said, "I am entering the capital gains after I drill down on Line 4 in ProSeries. There is a box there to enter capital gains attributable to income."

If you are referring to Sch D, Part III, the fill-in field below Line 19 and underneath Column (3) which reads, "Enter all capital gains attributable to income whether or not distributed," then that may be where the problem lies.  Do NOT make an entry there unless (read the instructions for that field) that specifically applies to your situation, which I wager it does not.

Only you can determine whether or not an entry is required there, but if it is not, delete the entry in that field and your problem will be solved.  No more AMT.