Symptoms

Cancel UI action is not working

UI action is not updating state

UI action is not updating field

Invalid State update

Cause

There is a UI action with the same 'Onclick' function name OR same 'Action Name'

Check your UI action list

Search for UI actions having the same 'Onclick' function name or same 'Action Name' as the UI action having issue

Having the same Onclick function OR Action Name can conflict with your UI action

Change the Onclick function name of your UI action.
Change the Action Name of your UI action
Make sure to change the UI action script as well if the script refers to the Onclick function or Action Name to change