I don't know what's happening, I haven't seen a bug like this and I've tried searching it up, I can't find anything like it except stuff on Java edition that won't work for me since I'm playing bedrock. I've tried restarted my computer but it didn't work. Every time I scroll I scroll through the hotbar at least once. I can't scroll one by one. Changing my sensitivity in my mouse setting on my computer didn't fix it either. Don't know if it's a problem on other platforms or versions.