I have used different types. Found out with most you have to press in one place for a good 10 count before. Lifting a dry iron. It is the 10 count which seem to be important and. In one place.
Even so sometimes it needs repeating. Oh a mistake I made during virtual day . The stuff which ever you are using go on the back of fabric. Hehehe.

I use the .99 cent fusible interfacing and never had a problem.