Um…by judging your stabilizer trim and aircraft attitude, I think you overwrite or use my mod with salty 747 mod, right? My mod NOT support another 747 mod compatibility in present version. (because my mod is under develop progress now)
that is not a normal. I and my testers and people who help public test always recover it soon. Of course, V0.65 had an issues about 1,000 feet slowly climb and descent normal flight path. But It solved in V0.66 and now I release V0.67. Download link is below
https://forums.flightsimulator.com/t/autopilot-and-flight-model-reworks-for-boeing-747-8i
Also, compatibility for other 747 mod is not tested and not officially supported now.