@defucilis I’m unsure if I understand your issue because I don’t recognize it. However, a general issue stepping back and forth frame by frame is lag and such. That usually happens if you haven’t re-encoded the video to get rid of the video compression. This is done by only storing so called I-frames in the video. You can re-encode the video using ffmpeg from the command line or use the tool FunExpander.
Funexpander is found in the software section, https://discuss.eroscripts.com/t/fun-expander-2-5-video-converter-with-ffmpeg-to-i-frames-added/4230.
For a complete ffmpeg command line example click on the last section in the right sidebar in this post https://discuss.eroscripts.com/t/how-to-get-started-with-scripting/2234 .