Something appears to be malfunctioning in the merge process. When I have the merge screen showing, clicking on an item in the left hand profile (for example) can end up leaving the same item checked in the right hand column. For example, on Jennison-425 and Jennison-2, I wanted to remove the parents of -425 when merged them, but I could not do so. It would also not let me just select text from one of the profiles or the other, but left both there, despite my attempt to not do so. (I went ahead with this merge and made adjustments afterwards.)
On a different merge, Stream-83 and Stream-9, it will not let me click on the right hand profile to change the end result to be what is shown in that profile (example, the birth date won't change). It also will not let me select just one of the profile's text entries, but keeps the merged text. (I didn't complete this merge.)
Today is the first time I have seen this issue, and it is a problem.