Sorry if this is an easy fix and a super newbie mistake.

I got a small kit for my daughter for Christmas. I made sure to get the proper catalysts for the resin I purchased as well. Read the directions repeatedly.
Pour looked great with little to no bubbles. Wasn’t worried about those at this point. When hardened, I popped out my test pour. Just make a small round disk (like a coaster shape). The bottom and center were very clear and smooth but the top and sides were very wavy and full of small waves. Any ideas?