Shortcode doesn't work

http://www.weterynariagalecki.pl

Yes but as i mentioned before now when im trying to make new form or even put the same again somewhere else it doesn’t show. Moreover the one you linked was made like that:
1. I insterted shortcode.
2. Copied code i get from shortcode.
3. Insterted code on seperate page.

Anyway now when i put shortcode in page/post etc. nothing shows up.

when i switch to another theme then shortcode works. Obviously it’s something with my theme. Any idea what it can be?

EDIT*

Ok i found out that if i use <?php the_excerpt(); ?> shortcodes doesn’t work. Any clue how to fix that issue?