So, if you're taking it out of the unanswered feed... what was the answer? The comments were about the double entry for a merge that you see in your family activity feed, not the glitch I was asking about, where the same pair of profiles are shown more than once in the profile's Match & Merge section. I had another one just yesterday, where I had removed the rejected merge & initiated a new merge but both the proposed merge & rejected merge were showing in the Match & Merge section at the bottom (the profiles have since been merged, so I can't point you to it),
I never did get an answer as to whether it is a glitch that is ok to ignore or one that might cause problems down the road. However, considering how long this question has remained unanswered, probably the former - just ignore it. Hmmm. Seems I've answered myself (even though I'm in no way qualified!).
Should I now close the question even though it never received an answer from someone who would know?
Cheers, Liz