Repeats not working

Repeats not working

On some of my appointments I get the following small logo next to the time:


What does it mean?

Furthermore on each one of the appointments where this small logo appears, I can't add any "Repeats". The drop down menu just won't appear when I click on it. 
I am therefore assuming that the above logo next to the time is linked to my not being able to add repeats to these appointments.

Thanks in advance for your help.

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