SPT upvotes are only visible on Splintertalk.io, not on Hive.blog nor on Peakd.com.
ALL content posted on Splintertalk should be visible on any Hive frontend because it is posted to the Hive blockchain. You can take any link from Splintertalk and replace the first part of the URL for peakd.com or hive.blog and should get the same article on the other frontend.