I don't know if this was intentional or not, but seeing as most ships default to their starting weight of cannons when captured, I thought I'd point it out.

The Dutch 1st Rate ship does 42lb/92 guns but the one I captured, came equipped with 92 guns that were only 4 lb.

That logic is all mod dependent.  What game/mod version is it?  I also know that most of the mods make the determination for the cannons  somewhat random, within the range the ship type allows, so there will sometimes be variation for each character granted a particular ship, so it may be intentional that some get lesser, but I can review the mod to be sure.

Oh gosh, I can't believe I forgot to mention the game, or... well I guess I SHOULD have posted this in that games forum instead of here. Sorry about that.

It's the ERAS2 mod, latest version.