How did you export? Do your render settings say custom? Do you know anything at all about video formats, codecs, standards or compression? 99% possibility this is user error on some level.
I'm pretty sure it is user error on some part i just cant figure out where !
Render settings say Best Settings. with output module lossless. I know basics of video formats and i have to export it as a H.264 quicktime file. I'm not the best with computers so i wouldn't doubt i've messed it up somewhere.
I've checked that the colour issue isnt my layers and no luck there.
SO i fixed the problem. Turns out i was exporting as an Avi. file instead of Quicktime. Feel like an idiot but glad its fixed !
You should never use H.264 Quicktime. Apple no longer supports it, it never worked well and can be buggy in playback. If you need h.264 it should be an MP4 rendered with the Adobe Media Encoder. The option for h.264 QT has been removed in all current versions of AE and Premiere Pro.