ZDoom: Skulltag and custom textures

Whenever I play a skulltag botmatch with a wad that has customized textures like Momento Mori 2, Requiem, etc. the texture flickers through numerous different textures at a rapid rate. How do I fix that?

just delete0 the animdef entry in the skulltag wad with wintex (select the entry named animdef and click edit then cut, then save it)