Nah that disparity is normal between these two amazons. UK one always favors SW over HW compared to US. I've always thought this is because a lot of europeans import from Amazon UK, thus combining SW sales from several countries vs one country (usually when people import from Amazon US it's just digital stuff, not retail. barring some collector's stuff of course)
A smaller difference, but there are other examples right now. Evolve #288 in uk, #375 in US
The souls games have always sold better in NA than EU. Yet, Bloodborne is #220 in UK and #568 in US
It's normal, just a difference of how people use both sites.
I have been educated.