CGC cases left side

I just got an order back of 9 books as well as just wrote to CGC regarding.

I found that 5 of the 9 books graded have the left side not sealed properly.

if you squeeze the left center you'll feel it is not connected, like a little breathing room. I'm just curious how many of you are experiencing and if anyone has any details regarding this? I've noticed it a lot. MY previous order of 2 books, both were like this. I wouldn't think much of it, it's not like the case is really opened up, but since 4 of the 9 are completely sealed, it's just really odd to me. As well, I've found it in probably a 3rd of books over all that i have purchased or graded.

any thoughts? understandings of?

Thanks!

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