Hi,
i never seen a case like this yet and i don't think there is some kind of shortcut button.
Try this :
In the events you can right click on the Events to see where they are (in which fsm)
and you can select them, then in the fsm uncheck the global
Also can you send a bug report inside unity (goto Playmaker/Tools/Submit Bug Report) and add a link to this thread.
For in the future, i would recommend to back up regularly (daily and on big changes)
Unity, playmaker and any other asset can have bugs, also if you make mistakes it is easier to revert to an older version.
And if you want to experiment it is also good to have backups.
You can use for example Sourcetree / Github.
I did use a naming convention between global and locals so all local events are lowercase and globals start with an uppercase.
This might actually have triggered the issue.
try naming Globals and Locals differently.
You can for example use this :
global : _MyVariable
Local : MyVariable
Also if you use addons like (for example) Easy Save. use different tag names (for example TAG_MyVariable)