OSC white square after exporting

Hello there, I recently made a round Drop Zone to use in FCP with some basic parameters and animation. Everything works like a charm but when I get to share the file, the OSC appear like a white square only for a frame (see attachment). This is only happening when I share the file, during the playback it appears once but after rewind it disappears, and it only appears at the beginning of an instance. I have tried everything from removing preferences to remake the generator from scratch but the issue is always there. Does anyone ever seen this or have an idea how to fix it? Also I use more than one instance in my project. Thank you in advance.