Have to hover over very specific part of object group to trigger pop-up

I'm sure this must be something really obvious (I'm new to using SL), but I've created a side where I want a pop-up text box to appear when the user hovers over an icon/text group. This is working, however when I preview it, the pop-up only appears when I hover over a very specific part of the group. I have to move my mouse all over the group to find the 'sweet spot' where the pop up will be triggered.  I set the trigger on the group, not just one of the objects.  Has anyone had this problem before? Is there a way to set it so the pop up will appear if you hover over any part of the object group?  Thanks!

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