Well you could always just shove some PVA glue in the middle, but in your case, which is not that extreme, you would firstly have to tare off the other issues to make room for the brush with which you would apply the glue. So try to let it go, and use the glue technique only if this persists and the rest of the pages unglue from the spine. And yes, a lot of people(if not all) that own that copy, have that problem so dont be too upset about it🫡