video is frozen on the first clip and glitches to that clip throughout entire video

my video on after effects started to glitch and freezes only on the first clip and is stuck on that clip in the whole video and won't play correctly with the rest of the clips. this started to happen when i added exposure on the clips, but when i tried to remove the exposure effect, it still remains frozen. I've tried to retrieve an old save but can't find it and I'm not sure how to fix this ??