On the right side of my screen in the middle, there's a text box that says "Uncommon Hat Bag 100%" (or something like that) but I don't know how to get rid of it. I don't have a hat bag in my inventory anymore, I opened the ones I have. I've pressed every button on my keyboard. Please help :((

My mod does nothing related to rendering text/popup like that, that is some other mod you have that likely desynced and thinks you are still holding the hat bag, if you are playing a modpack you should report that issue to the modpack developer otherwise try to find whatever mod is responsible for adding extra item popups.