I had a similar problem with mods attached. I had the RHS US and Russian mods running. Set an A-10 on the runway, started mission, took off, crashed (lol) and quit back out to the editor. The A-10 then powered up and started off down the runway by itself. It left its XYZ arrows behind and if I moved any of them the A-10 jumped back to the arrows and then tried to go off down the runway again.

I tried with the built in CAS plane but this did not have the same problem.