Distorted glitch coming inbetween frames - help me ASAP

This is a frame in between two clips, this is a 4k video edited in a 1080 sequence, exported in 1080p. I don't get this distorted glitch while previewing in the premiere pro. I get this after exporting, what's the reason? I have done exporting multiple times but nothing works. Also I think the footages were taken in 120fps.