no that wasn’t it either
i managed to fix the problem i doubled the length of all th clips that didn’t show up then i rendered them seperatly.
then i re -uploaded them and shrunk them down.
i think i had too many effects on the clips, for example: crop, pan, speed up, and the clips where very short.
but i appreciate everyones help I’ll possibly send you a link of the video to show my thanks.