Playlists repeatedly clearing

I started today with a playlist! Then I edited it (via web interface) and it cleared two or three times while doing so - I think I had to recreate it from scratch three times in the end. Finally it was done. Tonight I try to play it, and it's cleared again.
Also, it turns out you can't reorganise the order of songs in a playlist in the Android app - this keeps resetting too.
Getting a bit frustrated to be honest.
Comments
To be clear, are you talking about playlists under https://play.asti.ga/playlist/ or the play queue?
When you say it "cleared" what do you mean?
Can you give me the exact sequence of buttons you clicked/things you did?
Sorry for the late reply. It's playlists, not the play queue. All I did was go to the web interface, start adding some to an existing playlist and suddenly all the songs disappeared from it. This happened several times. I can't tell you the exact button presses, but it was as simple as searching for a song, selecting it and choosing 'add to playlist'. The final time, I am convinced that the playlist was correctly set up via the web interface. I closed the tab, then when I went to use the app later, again all songs had disappeared from the playlist. This was confirmed when I went back onto the web interface.
I'm really struggling to reproduce this. Here's what I've done:
Is that what you were doing?