not sure which engine you used, but I think there is a “continuous” vs “step by step” for high-velocity projectiles - like you’d normally use this for fast-moving bullets so they don’t go past targets, but when your game lag, the engine will simulate a time long enough that the ball might be considered as a fast-moving object and warp into bad place, so maybe it can fixes it? the thing is it’s quite the rare bug so it’s hard to check if that’s fixed or not haha plus it seems to be only a web issue (tho maybe low-end PC might probably experience it as well) that’s definitely not that bad hehe
if there is a physics-related settings it could also do the trick too
anyway thanks again for that incredible demo!!