u/Icy_Conclusion_8576

Good day. I bought the first volume of The Drifting Classroom Perfect Edition and I wanted to know, is the spine supposed to be glued to the pages and bend inwards? There were two copies of volume 1 in store and they both had the spine glued to the pages. For what I've seen on the internet, that's not how it's supposed to be (But it's weird that the two copies had the same problem). It looks like the spine is gonna crack at any moment. But idk.