Tool - one of the best, but Bullshit for "recurring appointments"

At first i am very angry, nothing are answer about Mails !!!

Than i have much "Recurring Appointments", and if i want to delete something in the past (only by one Time) it dont work.

The 2nd Think is that i delete all in the past and get new series, so that my calender (IOS Kalendar) is clean, and my own server (Synology) is clean too, but the Programm make his own entrys in the Past, thats absolutly Bullshit.

In the Attachments you can see, all in the past is clear, but on your tool not !!!