Hello there,
my last game yesterday evening (GMT+1, against Rattington) was a difficult one and I had to use the undo command "/undo", but the small dots didn't work. I used undo a few times (5-6) before I got fed up and evertime I used it, it took me back to turn 12 and bought a curse for me (which I definitely didn't do at that time).
It was a black market board with Haunted woods. Maybe that caused the problem, because I had to place my cards in hand on top of my deck after a black market buy, but the turn continued...
I had a similar problem in game #1602260.
I (accidentally) clicked play treasures at the end of Turn 10 and wanted to Undo that. My opponent granted, but that ended my turn with the log saying (and I apparently gaining)
m plays a Copper and a Silver
m buys and gains 2 Curses and a Silver
Afterwards my undo requests (also with /undo x) didn't do anything when they were granted. When my opponent used "Undo" it said "1 step", but undid two turns after I granted it.