Military AI Works

While awaiting the B-52 I read about in the MAIW forum, I downloaded this file: B52DGH_X.zip. It contains AI files also.
The problem is; once this AI departs, the tower may instruct the craft
to fly at 10,000 feet. The AI will respond-But actually levels off at maybe
25,000 before starting to decend to the 10,000 as instructed.
Using windows xp and fs9.

Has anyone else downloaded this file and made a correction so it will fly properly? Thank you.

If there are high mountains in the area, the aircraft may be trying to adjust for that. To test if that's the case. make a AI flight plan from a sea level airport with no hills around.