Container height problem

Hi, I have no idea what is going on here.

I have a hook block element (subscription form) showed after_content, and as you can see something happend and now it's not showing correctly.

The block itself doesn't have any problem when it's showed "on page", but when it's showed by hook it breaks.
There is another block before (Qué obtienes), with same hook but higher priority and no problem with it

https://aula.anafeliperoyo.com/curso/materias-primas-y-su-funcion-en-ceramica/

Any idea?

Thanks.