I can't get my trebuchet into my transport ship!

Here’s the situation, I play the Polish civilization on the island map setting but when I try to put my trebuchet on the transport ship, it’s not working. Can someone help me or can the developers solve this problem? That’s all. Thanks.


“Polish civilization” must be a mod. So there’s something wrong with the civ specific ebps/sbps of the treb.
Might be also, it is intended.
You should contact the author.

I’m pretty sure they are playing the Poles.