Can not edit/update lists - save/update button doesn't work

Can not edit/update lists - save/update button doesn't work

Hello
So I have a custom field in subscriber list. If I nere the email click on endit (pencil) and change the custom value to the new one, pressing SAVE button does not do anything. Also if i select multiple emails and then use the mass update feature where I change this custom value, pressing PROCEED also does not do anything. What is the matter, does it just not working, or am I doing something wrong?
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