Amazon certainly not renowned for either common sense or consistency. SLP will inevitably show up better on Amazon UK because we are a British-based 'label'. I also can't really go with the Amazon view that Bernard Cornwell's 'Sharpe' novels class as Alternative History....Just to note! Depending on whether or not you're going through American or British Amazon sites will drastically change your search results! I found this out while trying to cross-check @George Kearton's numbers, and, well, the results might be a tad depressing for the faint of heart.
'Hot New Releases' as of 1:44 AM (EST) Thursday 20th December, American Server, found with ( Kindle Store > Kindle eBooks > Science Fiction & Fantasy > Fantasy > Alternative History) search pattern
Return of King Arthur: #50
A Century Turns: #74
Shadow of Montreux: #80
A State of Unending War: #86
After that, no Sealion Press books show up in the search results.
EDIT: Also for some reason A Century Turns is showing up as #21 in Hot New Releases for technothrillers(?) in Germany, apparently. Amazon makes no sense, I swear.