Speedy8075

So I downloaded Forge 1.8.9 and installed the SBA mod (SkyBlockAddons) I have my key binds set for pvp as “Button 5” for the first slot and “Button 4” for the second slot (might be the other way around. Not sure). These are mouse side buttons So whilst I’m sprinting i try to switch my slots but it won’t let me it’ll just go to the slot number 2 for both my key binds (this is on Forge 1.8.9 still) (Bare in mind, any other client. My keybinds work perfectly fine. No problem) But when I stop sprinting, I can change it with that set keybind I don’t know what’s going on. But if someone could help me that would be amazing!!