Ah, I'm guessing you used to have the FeelThere one installed? Please delete the .dat files in your SceneryIndexes and that should fix the issue!
"AppData\Roaming\Microsoft Flight Simulator\SceneryIndexes"
Make sure there is no speed set in the FCU.
The A300 is not able to do constraints during climb irl. So if you saw this during climb, this is expected behaviour.