Bf109g's Antics

Some strange things is happening when I fly missions
the Bf109g's (enemy) dances around in the sky, loops etc. They do not break formation to attack ??? but stay in formation and do crazy stuff.
What can the problem be, aircraft or Cfs damaged files
can it be cured without reinstalling?.
Please help

What can the problem be, aircraft or Cfs damaged files

Please help
