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This behavior is intentional, as it has been reported (and marked as status-bydesign) more than once on MSE, and a request asking to change this behavior on MSO has been status-declined. The second link there has this answer by Nick Craver ("Architecture Lead for Stack Overflow") that explains why: The two categories are independent, linked questions are ...

I very strongly suspect it's an artefact of the implementation that nobody has been bothered enough by to do the work to fix, in that the lists are generated separately and then happen to be displayed next to each other in the web UI. Making each of the lists exclude items seen in the other would require implementation and testing time; time which is ...