Can’t change Graduating and easy interval

Somehow the option to change my Graduating interval as well as the Easy interval is stuck on my Anki desktop.
If impossible to click the arrows up/down and the default options (Graduating - 1 ; easy - 3) are stained in gray.
The other options are changeable with my anki so I can not understand how to solve the problem

This is likely caused by an add-on you have (maybe load balancer?)
Please see When problems occur - Frequently Asked Questions for a way to disable add-ons temporarily to find out which one is causing that.

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Reading the add-on description ( and user’s feedback ) will help you solve the problem.

PS. Compare this add-on to " Load Balanced Scheduler."