1. Scan is too poor to comment.
2. A lot of very early stamps, were "stuck down" that is any kind of mucilage they could find (elmers glue etc)
3. Early collectors had no idea of husbandry, how to take care of stamps,
let's face it you were showing similar signs
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I went ahead and used more force to peel it off.
That's a great way to create "thins" on your stamps.
Be gentle, try soaking one stamp in cold water for 10 minutes,
if the back does not separate, then it is a possible "stuck down"
there is nothing you can do, but mount as is.
Be aware a lot of these were forged.
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Hey, the price was right.
In that case, yes, you will certainly meet more similar stamps.
But that's OK, one has to collect within one's limits.
"You cannot make a silk purse from a Sow's ear" Circa year 1500