NC, I have seen some who don’t clap at all, and some who do with a shinui.
Perhaps there are those who mistakenly sometimes do and sometimes don’t clap with no significant halachic chilluk; that’s a mistake.
My point is that the R’ma was moreh heter for those who do clap, because they have a Tosafos to rely on (those who don’t clap hold its a shver’e. Tosafos which we don’t pasken like). Those who do dance and clap don’t hold that their minhag trumps halachah; they hold it’s muttar l’halachah (it was once explained to me that chassidim hold you’re allowed to follow a daas yochid b’sha’as had’chak, and dancing on Shabbos is considered a sha’as had’chak. Perhaps those with seemingly contradictory conduct hold when it’s not the purpose of dancing, it’s not a sha’as had’chak).