Incorrect version No registered by Adobe against serial number.

I have Photoshop Elements v18.0 which I will need to transfer from Windows 10 on my current PC to Windows 11 on a new PC within the next few months. It was bought from Amazon on 05/10/2018 as a genuine Adobe Upgrade Edition for which I still have the original box and the installation CDs in their sleeves. Photos attached of Amazon Invoice, installation CD and sleeve with two stick on labels, one showing Serial No. (partly blanked for security) and a second bearing what I presume is a product identifier.

I registered the product with Adobe  on 07/10/2018. The problem is that Adobe registered it as v16.0 (see photo) which seems supported by the small sleeve label [91112216  DVS/A,PSE,16.0,WIN,GEN,MUL,ALL] whereas the CD itself is undoubtedly v18.0 as evidenced by the photo of the CD and also the attached screenshot of the installed product. Is it possible that the seller put a v18.0 CD in a sleeve meant for v16.0?

How can I get this corrected? I like the features of this version and am definitely disinclined to move to the more recent whizz kid laden versions as I suspect (but am unable to find out) have shed much of the basic editing tools.