Hi, I would agree with Biggles50, custom clusters seem to do some slightly strange things, I think largely to do with the lower match limit.
It’s quite good at visually showing the relationships, but not as complete as following shared matches and then shared matches of shared matches.
However as I am discovering in smaller communities, you can get into the situation where although you are a match to all of them, as you dive deeper you can switch from a match on the paternal side to a match on the maternal side, while their match to each other may be through a third relation.
It’s a matter of patience and building those trees.