I started this game yesterday: lichess.org/I6NV3hTiCryz — but this morning the site says I resigned, but I did not resign.
The only out-of-the-ordinary thing I did was to start the game on the Web site but my last interaction with it was from the Android app.
This has happen several times before, though I can't remember if I switched between the Web/mobile interfaces on those games too.
You can't post in the forums yet. Play some games!