NInja forms do not show correctly on first website load

Hi there,

I have a problem with Ninja forms on this: http://www.smartangels.cz/join/ and that page: http://www.smartangels.cz/contact/

1. On the first load of this pages, the styling does not work and the fields are smaller and squeezed. When I refresh, all goes back to normal.

2. I am using WPML string translations plugin and managed to translate this line to Czech: Fields marked with an * are required but for some reason, it keeps showing in English.

I cleared caching but the same problem stays (seen also by my client and on other machines). Any idea?

Thank you for your time,

Joanna