The global leaderboard bug is now fixed. All scores are showing correctly again and new runs are being saved to a single leaderboard.
Known quirk: some older entries may show as Level 0. This is a side effect of merging the old leaderboards.
Thank you for your patience and for reporting it. If you still see anything odd with your score or ranking, please let me know here or in the Steam discussions.
Keep climbing, knights!
angadev7