Glitch Report

There’s a glitch when changing the cover size image. It doesn’t optimize to the proper size. Here’s the instructions on how it happened.

2 years ago, I set it up in this exact order.
300px
600px
900px
1126px

I recently changed the 300px value to 400px, and now it defaults to the full size image on mobile screen size above and below 400px.

Could you take a look at that?