But: Click on it and it's gone!

X-subject made and the check mark remains ?

Works for me on: iMac OS X El Capitan, iPad Pro, iPad Air, iPhone 6 all iOS 10.0.2.

Windows

Hello @schneebaer47
Try clearing the cache and history. And with Firefox, I often have no problems with that.
Otherwise, please contact me again if it doesn't work.

Best regards and have a nice evening, Simone

@Simone
Cache, history and the rest are cleared daily. Not with Windows either. Greetings and have a nice day

...the check mark could be removed today

Hello@schneebaer47

Juhee. Thanks for the feedback.
We always try to fix such technical problems as quickly as possible. But some can take longer.
Best regards, Simone