Calendar doesn’t grey out when date changes

Hi, the calendar it doesn’t grey out since the 23.07.2020 on the pc when the date is changed. It still displays previous dates like they are available. On the phone, it works fine it updates itself but on a PC I have to clear all cache in order to update the calendar (grey out). On a pc, you can still click on the calendar on a previous day and the booking list will open. The good part is it won’t let you make the booking. Do you have any suggestions on how I can make it update automatically again? It worked fine until 4 days ago.