[rich! @ etiviti]

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*Page 1 of results is not sorting properly, at least on testbp.org; something weird is going on. But if you click through to page 5, for example, it does sort by real name correctly (“Aaron Brazell, Aaron Castaneda, Aaron Chaote”, etc). If you look at the link to their profile, that uses the username (as is designed), and in the case of Aaron Brazell, as an example, you see his username is nothing like his real name. But not on page 1.

This is obviously a bug, as the latter pages work, and this is useful feedback. The BuddyPress developers can only fix bugs if people report them (https://trac.buddypress.org/).
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@DJPaul – same issue related to this trac ticket?
https://trac.buddypress.org/ticket/1670