Is omnibus' binding damaged ?

Guys, I just recently bought Hawkeye by Fraction omnibus and before reading it watched few vids like "How to properly open Marvel Omnibus". After flipping some pages I noticed that brown lining came apart from binding.
Here the questions: should I worry about it ? Is my omnibus damaged ?

Here some pictures of it:

[url]https://imgur.com/RSN1Utf[/url]

[url]https://imgur.com/u3a2rC0[/url]

For example, this is how the binding with brown lining looks like in my "Spider Man: Tangled Web" omnibus:

[url]https://imgur.com/HXJfKMA[/url]

[url]https://imgur.com/pRVhkh4[/url]

It’s fine. What you need to be concerned about is when the cloth separates from the glue on the pages...that strip of paper is nothing to worry about.

I think that happens when you store vertically? I heard it's better to put them horizontally on the shelf