Oh... okay... nUI has no control over that tooltip. I believe there is a setting in the WoW interface options menu though for that.
By the way... you have a *TON* of redundancy in your addon list, you're aware of that, right?
For example... you have three different bug grabbing tools... !Swatter, !BugGrabber and BugSack. You also have XPerl and Bartended, neither of which should be needed with nUI. Another one that jumped out at me was both Gatherer and GatherMate as well as both Prat and WIM.
You might want to seriously consider doing a clean install to clean up all the excess addons you likely aren't using anymore. See this post for instructions on how to do that:
http://www.wowinterface.com/forums/s...ad.php?t=21716