Did you press all of the fluid out with a credit card after you laid it down?

Some vinyl has tiny vent holes in it (millions) it could be possible that the fluid underneath never left due to the triple thick???

Just a guess ... Vinyl sucks and I work with it all the time.

EDIT .... I think the triple thick was still gassing off and affected the adhesive on the vinyl.... I always wait 3 days after any paint is on a wall before I put any type of adhesive on it ..... you need vid1900 to chime in on this.

Windex has ammonia which is not good for adhesive ....

Most vinyl guys use a drop or two of Johnson and Johnson Baby Shampoo ... Cheap and Effective...