Please fix this autopilot issue – Aerofly FS 2021 Review

So I’m in the middle of a flight and my autopilot would be set to 21,000 and eventually I would reach that altitude but then sometimes I have to get off to go do something. Well when I get back on and resume the same flight it says that the autopilot is flying at 21,000 but then I hit the autopilot button and it drops me back to 12,000 feet and my plane then starts descending when I’m nowhere near the airport. I hope you guys can fix this soon because it makes my flight feel unrealistic or weird in a way because why would I climb to a certain altitude but then just randomly start to descend right away? Besides all of this though it’s a great flight simulator!
Review by Gunnerio on Aerofly FS 2021.