Nope, app can't be reinstalled as it's not actually installed on your system. But all websites store cached data for faster loading and other such procedures. I would recommend that you clear your browser cache and the cookies as well.

Btw this same issue happened on my own computer. Was during a live match of my own. It occurred only for that match though. Not during friendlies or my other match for the day. :/

We're trying to find out what's causing this atm. Really sorry for the inconvenience.