I'm new to H2N but as far as I get I can see 2 reasons :
1/ your stat is not in your hand history for this opponent
2/ the stat exists but you did not "rebuild" your statistics, and therefore H2N did not get it.
Ok, it tooks around 3hours of install/reinstall H2N or copy/delete DB
But it somehow works right now. it seems that it has problem with H2N version. If i copied old H2Ndb (from 18.104.22.168) into 22.214.171.124 version it crushed. After update od 126.96.36.199 and copy h2ndb, its working...