carpet protector blowing bubbles when used in hydroforce ?

[leofry]

When i use Maximum advance carpet protector its blowing bubbles out, whats causing this ?

 

[Jack]

I would say you're sucking air some place.

 

[leofry]

ok i thought that might be it but it only does it on the scotch guard but maybe the top does not fit exactly the same

 

[Artie09]

Yup, it's air