The tags for the tooltips of the items contain illegal characters which kick you out of the game.

https://www.curseforge.com/minecraft/mc-mods/show-me-what-you-got

Bumping this issue - players from our server are also encountering issues getting kicked due to illegal characters when linking items that have colored rarity from Tierify.

This has to be fixed from Show me what you got's side. There's already a PR to fix it but hasn't been approved.