I use both lichess in a browser window on my computer, and on the lichess app on my mobile phone (ios). When I do training "puzzles" on the computer browser, then later attempt to do puzzles on my phone app, I *always* get the exact same puzzles I already completed on the computer. I suspect there is some sort of db synchronization issue at fault here, but I am no expert.
I am just reporting the bug because I would like to see "fresh" puzzles, regardless of whether I'm on a browser or the mobile app.
You can't post in the forums yet. Play some games!