Could just be your style of play man, Ive never had this personally!

i don't know i pass and move or pass and run

how do you play it does my head in I'm trying to save up and healing cards are like 2.2k for leg or all injurys

Honestly, for me, injuries were probably the most rare thing, the main thing i got hit with was red cards but other than that my players were fine, maybe you just make them run to hard for too long, try not to make them run the entire game because if they have no stamina and you try to make them run they get pulled hamstrings and things like that

Probably because your players' fitness is too low. Making them more likely to get injuries.

You do have players in your team that have a tendency to become injured on a regular basis. E.g Walcott.

thanks but that how i play i might need a fitness team and there always on full fitness i apply squad fitness every match