You can try to empty your browser's cache, or open the app in an incognito window. You can find detailled instructions on how to clear your cache here.
Your browser stores data of the app on the your computer locally, so that it doesn't have to download it again every time you access it. Sometimes, in case there is a change on the App, or after too many logins, the cache data can be outdated or corrupted; this is why clearing your cache might help with logging issues like this one.
If this doesn't solve the issue, you can submit a ticket HERE immediately and we will make sure to solve it for you ASAP.
Thank you in advance!