Dental Crown that is too short? Is this normal?

Hi!! I had a dental crown placed on my back molar after a root canal in Oct 2022. I had issues with my bite and had to have my crown filed down. In January, my dentist noticed an open margin and had to replace the crown. Since it was replaced, it is much shorter than my original crown and the tooth next to it is now hitting with more force than before. I think the dentist made this crown shorter bc of my original bite issues, but it looks like a mini tooth. Is this normal? Help!