Hecarim and kallista are not listed as rivals
At least on hecarims information page, even though his lore has him spearing kallista in the back
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The Friends and Rivals thing should be taken with a heavy, heavy grain of salt, because, IIRC, it's never been updated, and it was around before Hecarim's lore rework (Or Kalista) was even a thing.
These are outdated and narrative wants to redo them in the future.
Because she can't remember who she is angry with. Shadow Isles side effect
I always wondered why they never updated that. I know there's a special team for lores, so their excuse can't be that they're busy with other things.