Ohh ok, now I know the issue. Champion's bracelet really is bugged, it was supposed to nulify freeze, but somehow it got past me that it's just reducing the chance instead. But athlet's bracelet just reduces the chance by half, that's why it's "resist" instead of "null". However, Lillian's chance to freeze is pretty high (80% actually), that's why it's happening so much. I'll nerf her.
I'm working on a patch, will release it still today (on my timezone it's 17pm now)