Hello there!
Don't know if it's a known bug or not, but I had my Xebec's model doubled one day. It was a Merchant Pinnace before and it changed it's model after I repaired all my ships and re-supplied them; I'm not sure when did it exactly happen. I tested it in order to compare to the original Xebec and I'm pretty sure all the parameters were not changed - it was still slow and hard to manoeuvre as it should be, the cargo capacity didn't change either, I was able to load 6k. So I guess it was only an issue with the model.
Don't know if it's a known bug or not, but I had my Xebec's model doubled one day. It was a Merchant Pinnace before and it changed it's model after I repaired all my ships and re-supplied them; I'm not sure when did it exactly happen. I tested it in order to compare to the original Xebec and I'm pretty sure all the parameters were not changed - it was still slow and hard to manoeuvre as it should be, the cargo capacity didn't change either, I was able to load 6k. So I guess it was only an issue with the model.