If the description of a merc has less lines than the ones before, it will not clear the existing text. For example select RedEye (5 lines) then Proxy (3 lines) - the last two lines don’t dissapear:
Merc text doesn't clear in selection screen
Djiesse
(DB Genome editor)
#2
Reported nearly two months ago…
http://forums.warchest.com/showthread.php/38767-New-Squad-Selection-and-Waepon-Customization-UI