I seem to crash everytime I join a sub server of the main server I play. The only reasoning I can think of is due to the mass amounts of players and the new GUI that was implemented in that subserver?

Does Better GUI cause a feedback loop if there are hearts already shown in the main server (pre-aristois)? Would love to know, I work fine with vanilla Minecraft, but the client dies after a few seconds or won't even load into world if I am in that subserver.