I'd love to file this in BugZilla but it appears to be broken ("Webpage is not available"). And I'm not 100% sure it is a bug.
When I create a grouped list with two labels, and the first label has two or three lines, everything works fine. BUT if any line is short (say a few letters) then the second label gets screwed up (see image). I have coded around this but am interested in whether this is a bug or I'm doing something wrong.
Notice in the image that the first entry is broken because line 2 is short, but the third entry is fine, because line 2 is longer. Also, if you tap on the first entry, the third line (in blue) disappears!