When I play using this mod I have only the vanilla health bar no matter what I do even if I force render rpg hud bar. I will include the modlist and while they are not currently in the mod file I also use tinkers construct and tinkers leveling.

This is caused by mantle.

Find this in the config of this mod:
# Prevent the render event of this element. This might disable features of other mods. §cActivate this if another mod renders §csomething you don't want §cand can't disable it otherwise §cWARNING: Might disable other things, tooB:prevent_event_health=false`

and set false to true. This should fix your issue.