Frames from different clips shows up where its not supposed to

So I think I tried everything everyone said on here, and nothing was working unfortunately. I'm pretty sure there was some user error for sure, and I messed up the clips and project up when copying files over as well as a copying and using a previous project for this client to try and save time (talk about backfiring!). Then my new drone somehow named clips the same file name as my old drone and I didn't catch it until after I was already well into the project and made all the proxies (which then created another problem...ha, ha!), etc. HOWEVER (I hope you like run-on sentences), what I FINALLY FIGURED OUT that worked for me is the Rate Stretch Tool (R) that I'm not as familiar with...and that did the trick! It's probably just a work-around, but I don't care at this point because it fixed what I was having issues with, and will maybe be helpful and save someone else hours and hours of troubleshooting. So give that a try if nothing else seems to work for you either, because I was able to end and start the clips exactly where I wanted on the beat, without them carrying over incorrectly into the next clip for whatever reason. (Hopefully this makes sense...good luck!)

yes I'm hving this exact same issue at the moment and it's driving me bonkers trying to figure out why these flash frames won't go away> had to come online to look for help 

Mhy clips fully merg into naoither and cereate media that doesnt exist. WTF Adobe. 

Five years on this glitch continues to plague us all - the delete rendered files doesn't quite solve it, nor a few other fixes on this thread. 

A long awaited patch would be nice Adobe, thank you! 🙂

I just have to say after years of reading solutions and not asking anything, i have activated an account only to say THANKS both for the question and also the answer exposed here. This is really a time saver. Thanks again Seth and Henrik 😉

Solution!!! Delete render files and re render!!! It works!

https://m.youtube.com/watch?v=2gtJ9qkVr-k

No Cap. God bless ya! 

Hi there,

I encountered this problem recently and managed to resolve it by adjusting the sequence settings. In my case, I changed the timebase from 29.97 fps to 30fps & this essentially eradicated the issue. You'll need to review and cut your footage accordingly afterwards to ensure everything is still in sync but this is a necessary evil in the grand scheme of things. 

I know exactly what you're talking about. It's Feb 2021 and I just had this issue. It seems like this is an issue with the rendered preview files. Setting my In and Out point around the timeline, going to Sequence > Delete Render Files In to Out seemed to fix it. You may need to re-render your sequence but try to edit without if possible to prevent it from happening again.

Nest your clips it should get rid of those unwanted frames