Hi
Seems that you have something wrong in your search preset. You have two spaces before and after the mint field
You need to clean up your presets, because these two spaces will break the process... you need to see what's going on on the server side, but I'm pretty sure the problem is there.
So, clean the filter with the reload button, and delete all your presets.
If it doesn't work, remove all preset into the section Administration->List of values->Settings and tools->Search presets temp
And delete all of the records.
If doesn't work, remove the Search presets Administration->List of values->Settings and tools->Search presets
And log out and log in.
I hope it will clear
Best