Sorry but I'm not really sure what you are asking, or what the thread title means? DNA Painter's shared cM tool gives 1C1R as a possibility for both 385 cM and 180 cM. You don't say how A and B are supposed to be related to each other so I don't know whether 395 cM fits with that.
I got a PM from you the other day but I was away on holiday, so I will have a look now and see if I can suggest anything to help.
Also if they are using the new "Sideline" feature on Ancestry to see which side their DNA matches are on, it is still in beta and it usually says Parent 1 and Parent 2 and the person who took the DNA test has to determine which of those parents is their mother and which is their father, so it is possible for people to mislabel them.
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