It seems it was a well known problem and they are seeking a remedy. https://www.coinworld.com/news/paper-money/2019-coin-and-currency-sets-shipped-with-dislodged-note
Seems like an easy fix, a similar problem happens to graded notes When there is to much room between the front and back of the holder Allowing the note to almost move freely as it seems in this case A little prompting of the note can usually fix the issue with out going To the haselle of having to return it.
It's wandered over to the adhesive and it's stuck for good. I got one like that too, as did just about everybody else that ordered that set.