App constantly corrupts video file on export

I've used this app for about 3 years and have a horrible time getting any assistance. For one, most videos that I export contain corrupted segments that are not corrupted in the app. Once exported, they have pixelated, blurry spurts throughout. Secondly, on random exported videos, I get a white washed filter over them like the saturation was halved. Yet in the app it looks great. Any help or assistance with these issues would be great.