200 BPM bug

For some weird reason all guns that have 200 RPM shoot audibly and visualy slower than 200 RPM. this isnt a bug of the entire game, it just affects me and maybe some other people. i only found that out by watching a youtube video about the Vilkas and it was shooting way faster (200 RPM) than my Vilkas (<200 RPM). is there a way to fix this?