I am attempting to rankup from Ultimate to Invaded on KitPVP modern, yet I keep getting the error message "You don't have the necessary rank to buy this". This is wrong, since I do in fact have Ultimate. I have gotten this exact upgrade before and it worked, so I have no idea why it doesn't now. I am trying to use a store voucher, and since those have expiration dates, time is a factor. I am hoping that a staff member can help sort this out.