Hey there,
i have a big problem with finding duplicates.
Somehow there are only 2 available fields( Office phone, Other Email). I can’t restore the default field by using the quick repair function.
I don’t know where i can look anymore to restore this fields.
Please help!
what version are you using?(Suite and php)
You know of anything that may of caused this? like someone you did recently like an upgrade or file change?
*Clear your cache just to make sure 
I solved the problem by myself.
Somehow there where in custom/Extension/modules/Leads/Ext/Vardefs files for all fields and they overwrite the default settings for merge and finding duplicates.
By deleting the custom file the default value was set.
Thanks for helping 