Resistance Penalty Bug?

I encountered the same problem.
today it is -10% and I'm already in maps.
Im lvl 82 and -10% it's too much

This information is displayed if you check the Map Node keyword on the Atlas information legend (the (i) in the top left).

I agree it could be made more clear on the character sheet or Resistances keyword.

The information should be shown in the character sheet for sure, not in a random icon in the "atlas" itself. To the best of my knowledge they didn't announce this was a thing in the past. It wasn't even in the poe2 wiki until I added it myself.

I don't understand why we suffer an additional 20% penalty compared to PoE. Right now finishing act 3 Cruel gives 60% penalty, which lines up with PoE endgame. Why players get punished further makes no sense, and seems unfair. I get that they introduced higher "% All Elemental Resistances" and removed chaos resistance from the penalties but the fact that higher % resistance gear doesn't drop until you are doing at least tier 13 maps irradiated seems really unfair and punishing to players just trying to get gear. Pinnacle bosses reducing resistances/penetrating would make sense as that's the peak content but 20% more penalty in maps really hurts. Might not be so bad if crafting was easier but even with omens & essences it's still tricky to get the stats you need with raw crafting.

Edit so it doesn't seem like i'm just a hater:

The resistance penalty is not just applying to maps, it applies to the trials as well. It needs to be shown somewhere on the character screen and made permanent so the player can have full understanding and knowledge of their resistances. Make it so after completing a Tier 6 & and a tier 11 map your resistances are permanently reduced and have something in the character screen that explains that with a hover tooltip. My resistances go from 75% in hideout to 135% in Act 1 to 55% in tier 11+. Shouldn't be fluctuating depending on where I am.

wow, i just spent all my currencies to get my resis up and then went to a t11 map only to lose another 10 and now have to rebuild everything again? This is an absolutely stupid concept!