Can't remove added monitors

Can't remove added monitors

Hello!
I've modified the device template "Linux" and added a view new monitors like "Free Disk Space" and "Processor Temperature".
They were grabbed by all linux device in the op manager.
Now I want to remove these monitors from some devices.
After clicking the remove button I get the message "Graph deleted successfully" but the monitor is still in the list.
What am I doing wrong??

I hope somebody can help me,
thanks a lot!

Mok









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