So I’ve managed to put my helmet into the crafting tab and then put in my armour ontop of it. I’m now unable to remove the helmet from the crafting tab.
EDIT : I managed to get out of it somehow through a mixture of dropping an item that was ‘picked up’ by my cursor and equip/unequiping my chest armour. In the end nothing was lost but I couldn’t interact my crafting tab properly so I relogged.