Hello, and welcome, EvilPaper!
It is likely you won't get detailed technical help on ospfd(8) here; there are only a few folk here who respond regularly to OpenBSD questions and I can't recall OSPF being mentioned in any prior forum post. If you don't get any assistance within the next couple of days, you might consider posting your question to the misc@ mailing list. If you do post to misc@, don't forget to also post your sysctl settings, your PF configurations (redacting any "real" IP addresses), and your dmesgs for both firewalls.
I don't use OSPF, so I won't be of any help. I do know that a number of major changes to ospfd and ospf6d were enacted for OpenBSD 5.0. If one FW is 4.9 or 4.7 and the other is 5.1, those differences may be a factor in your search for a root cause.
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