Yes, that doesn't look right. I suspect it's something to do with the collapsed entries (with the yellow '+' marks) just to the left, but it shouldn't happen. I'll investigate next week. To help me, can you tell me

(1) which version of MRBS you are using?
(2) how you got the collapsed entries? It should normally only be possible to get them if you change the resolution. If they appeared by any other means then it's a bug in MRBS.