This happens to me all the time. As others have said you've punched too closely... It happens. What works for me is lightly spraying the back with water and ironing with a towel (bc I use acrylic yarn) over the piece. Usually that softens it to flatten it out.

Is that before or after you put glue over it ?

That would be before the glue. The glue will be the final action to set it.

As someone mentioned, the punches are too close together. If you’re displaying the loop side, punch the back so there is at least half-the-size of the yarn size stitch between rows. And if your making something to hang, you don’t even need to glue anything. The stitches are well secure.

Oh wow!

from what i know you can prevent this from happening if you apply glue while its still in the hoop/frame

Ahh!

I had the same issue on my first few pieces….I think I was forcing too much yarn into such a tight area

Probably am haha!

Based on the back, you don't need to punch that close together.

If it’s acrylic yarn be careful ironing, you can melt it. A towel/fabric between the iron and your yarn can help prevent melting

Oh yeah I should've mentioned that, I forget not everyone knows exactly how to iron lol, yeah a piece of fabric between is definitely recommended.

Brings me back to sewing class. The smells.

Such a helpful tip!

Iron the back or put something heavy on it.

Oohh

I took my first piece off the hoop and this happened! What did I do wrong if anything? Was it too tight or…

With your next piece try putting glue in while it’s in the loop and wait it to harden this might help