Skipping nfts or rendering them too fast (Please help)

[RequiemDreams]

When generating wether it’s 100 1000 10000 i the program will produce images perfectly however some of them get skipped and end up looking like this

Any ideas as to why it could be skipping some nfts and hoe to fix it would be greatly appreciated all my exports are framed and transparent as well as png so it must be of coding error or trying to produce images too fast.