item in hand bug

If you have an item in your hand like blocks and your spamming the right-click button and go to another Hotbar where is a sword of something than sometimes it will glitch, the hand does not update to the new item, or if you were before on Hotbar 9 with block and go to Hotbar 1 where is your sword it automatically goes back to Hotbar 9. This glitch is already there for a long time so can you please fix it it's really annoying while PvP'ing.

Sorry that my English is not very good.