Most importantly: This hand is like 40bb deep and you are running push-or-fold calculations, the results are not going to be useful. It's really not recommended to play push-or-fold at these stack sizes.
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HRC says UTG should play A3s and AKo but fold KK
it's unbelievable
can anybody describe me how come that HRC says it?
Regarding correctness:
We have deep stacks and a payout structure that discourages confrontations. When you check the calling ranges, they are mostly AA / AKs, with a few KKs included in later positions. Blocking an Ace with hands like Axs is more important here than the extra equity from KK.
This is consistent with more general results for deep stacked push-or-fold, check the example calculations in "Mathematics of Poker" if you have a copy. At very deep stacks the first hands that become pushes besides AA are A5s and ATs and the first call outside of AA is with AKs. (Again, this is not relevant in practice because actually playing push-or-fold at these stack sizes is generally a very bad idea.)
Quote:
another interesting question:
why cupra and kju in analyze has C (call) mark and the rest players - 3B?
That's simply based on stack size. You are calculating push-or-fold action. If a player's stack is larger than the original pusher's, then pushing is technically a 3-bet. Otherwise it's a call.