error on entering creditcard expiration date

I tried to buy lightspeed bundles on the webstore, but when i tried to enter the expiration date of the creditcard, wich should be 01/ 24however , when i try to type this date it is automatically turned into a fracture like so: 01/24 this happens on the forum and in the webstore, please fix this. or i will have to buy the lightspeedbundles on ios and it will be much more pricy