Zeight

i am just guessing: glue issue  or the headlight may have factory coating ....

Rather than stripping it you might try using a diabetic needle to relieve it. Straight in at the edge of the bubble, thumb nail or squeegee to force pressure, then pull the needle straight out. I would save the extra materials to do another set unless it really bothers you.

If that's your first diy, not too bad. The top circle looks like you left too much moisture behind. The bottom circle looks like a speck of debris.
To get a diy kit to look professional you'll usually do it twice or more and will cost as much as having it done retail.
The benefits of diy is the satisfaction of your own craft work and then knowing why a pro charges what they do.