I do not see all appointments in my Icloud agenda, while I still see them on my ipad.

I have an agenda on my Ipad that I also want to check online when I'm at work (using my work computer) or when my partner is at work (using his work computer)

We now do not see about 90% of the appointments anymore, while they are still there on the ipad.

Also tried at home and also there the appointments are gone.

so used 3 different computer so can not be the browers. At home we tried 2 different browers, both same result.

Does anybody know what the problem could be, or how I can resent my Ipad agende into the iCould.