This is not a bug, per se. But it is an issue that should be addressed.
Since ramming was removed from barbarian ships (why do they all have viking ships, anyway?), there's a plethora of techs and skills and traits that give all this +ramming strength... that are utterly wasted.
It makes getting or taking those less than appealing, and it looks very sloppy to boot.
Please rework all the barbarian ship techs/skills so that they are actually useful to barbarians.