Confirmation link occassionally not working

Hello together,

occassionally the link to confirm the subscription does not work, but I don’t know why. Currently, I have five unconfirmed subscriptions in my list. I contacted them and they all opendend the link. But instead of the confirmation side and empty side appears and their subscprition stays unconfirmed.

Is this issue known? It also happend to me in test szenario once, but I could not reproduce it.

What I noticed generally: When I click on the edit icon of a single subscription and try to change it, an error occurs “The email that you typed is not correct.”. This happens on all subscriptions, independently whether the confirmation worked or not. When I try to change the subscription by the batch action, it works.

Thanks
Daniel