There should be a rejection message stating why it was rejected.

if I had to guess its because your video is very low quality

I saw on the loading screen hybred I think you need it to be totally vanila

pretty much, you used mods or something weird, so the loading screen was different than it'd be on vanilla

iirc textures also aren’t allowed.

Textures aren't allowed at all? Could you not use like Plastic for example?

Like I said, iirc not no. But I’m not a mod ask them why.

When a run is rejected, there is a rejection message attached to it. If you feel that it doesnt really answer your question you can message one of the moderators either here on sr.c or on discord.