Premiere pro clips keep glitching back to a different frame.

I've been making a new premiere pro video and I added a "black video" clip from the bin and laid it over parts of the video where the audio beat dropped. everything was fine but then I rendered in and out and now no matter what the first frame of these small video clips are always showing up as the first frame of another video I had imported into the composition. I have no idea why this is and I already cleared my cache and it did nothing. please help lol.