hi thanks for the response! according to my Google achievements I've won hard mode reborn 5 times (5% complete for reborn hard 100), although I know that number should be higher. there is no local record for reborn on hard at the bottom on leaderboards like there is for the other modes. I have been travelling in another country with my network set to roaming during the last week and a half which is when the bulk of my wins took place. I'm not sure if that had an impact.
edit: just won one game to test. my achievement score went from 5% to 6% so that appears to be working correctly, but there is still no local record in leaderboards