They give you level 2 of that effect instead of 1. Seems like an odd oversight.
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[media][media]
Hi there!
I can confirm this.

Confirmed also relates to MCPE-52364.

I have posted a data pack above for the Totem of Undying to give normal Fire Resistance instead of Fire Resistance II:
[media]Totems also give Regeneration II, may be intended

Fire resistance 1 and 2 do the same thing, and it to me seems like someone typed 1 on the code, and computers count from 0 so it resulted in level 2. No offense to Mojang.