The project I'm working on has a few layers of video and Hitfilm turns some of them upside down with no warning. When I rotate them right way up, sometimes they stay put and sometimes they don't. I spent time carefully going through each section of my video and made sure all were correct in my timeline before exporting - lo and behold, in the exported video all the top layer videos are upside down! How am I supposed to rectify this if I can't see the problem? Am I doing something wrong?