Images in carousel not same height

Hi there,

I am having trouble with height setting of my carousel. I have landscape and portrait pictures, so I set option use default size on all pictures. It’s all good, except these portrait pictures are a little bigger in height than others. I have tried setting picture size of landscape pictures to a little bit heigher, same proportions than it is thumbnail od portrait pictures, but carousel still sets it on it’s own – so smaller than portrait.
Can you please give me advice what to do?

http://eving.si/oroklan/galerija/

Thanks. Regards, Eva