Spawned in on a modded server (Trump's Wall USW1) on which I was playing earlier this day. Spawned with 8 wounds despite having none when logging off earlier. Relogged, spawned with only one. After a few seconds of running, when I jumped, wounds jumped up to ~15. Every time I jump the wounds go to some number observed to be random between 1 and 25, and when I land, they change again. I am not losing blood, but can see the bleeding animation and stand in a literal pool of blood if I stand still for a few seconds. The shoes I am wearing are in pristine condition, and when I try to bandage, it starts the loading wheel but interrupts it immediately. Number of wounds stabilizes when I run around and only fluctuates when jumping. Usually, but not always, number goes down when I'm in midair from the jump, and a moment later when I land, the number jumps to somewhere in the range of 10-20, or very rarely to around 4 or 5.