Polylang gives a problem with css on subdomain.

First of all, Polylang is a great plugin!
Gave me some hard time and headache’s but still good plugin if you know how to work with wordpress.

Let’s come to the point, I’ve made my own a theme with some css. When I installed polylang it worked great and I added subdomain option. But at this moment when I go to the english version and click on a post, it will look crappy because it’s not taking the css seriously.. It download’s my css, it has all the classes in the html structure but it looks like it just doesn’t accept my styling? But when you look to the dutch version of the website and go to a post, it does look correctly. Here is example of the problem:

Correct view in dutch: http://g-custom.be/this-is-my-fifth-post/
Wrong view in english: http://en.g-custom.be/this-is-my-fifth-post-5/

the en.g-custom.be is using a pointer to the root folder of wordpress. (which is my first tought of the problem but links looks correctly when opening in en.)

To choose language you can see the flags of polylang at the bottom.

Already a big thanks ahead for support.