My parents claim me. I entered that info in when I did my taxes and now my parents say there is an issue. How can I see if that is correct?

If you look at your form 1040, you will see next to Standard deduction a check mark in the box for someone can claim you as a dependent if you marked it that someone can claim you.

If you did not, then you will need to Amend Your Return to say that they can claim you.