Minecraft items in hand switch by itself?

Hi

So I have the problem that when I play mc I often just change the item in my hand without pressing anything and I don't know why. I don't accidentally scroll with the mouse wheel or anything else.

Maybe someone knows something

Does it scroll continuously? If so, the mouse is broken or the key is stuck.

Sometimes just switch it

Then maybe wrong hotkeys?

If you have a hack client, "AutoTool" may be enabled.

Maybe you set "Slot 4" to "Space" in the Conteols or something like xD

And maybe with the other slots too

I think I kind of got it. If I play without Optifine, I don't know why, thanks anyway