Oil filter housing leaking, can't get it to stop SB 273

I had the area under the bolt-head itself leaking after re-installing an engine that had been in storage for a few years. Purchased a 1 3/16" combination wrench to tighten the bolt a bit more but strangely that did not stop the dripping from there.

I changed all three gaskets and it stopped the problem for now. But I must admit, leaks from under the bolt make no sense to me at all when the bolt is good and tight in the first place.