I was reading the QA at this link: https://www.sistani.org/english/book/46/2027/

Towards the bottom, if I understood correctly, it says if the experts do not identify one scholar to be the alam and instead identify a group of scholars to be equally knowledgeable& pious (which seems to be the case these days), then they are allowed to follow whoever in the group they wish (and I understand they can follow different people in different areas). Have I understood correctly?

I’ve never heard of this before. If this is true, I really wonder why people are always battling each other over their choice of taqleed.

Your understanding is correct.
But how you judged that it is the case these days?
From my side, I see that S. Sistani is the more knowledgeable person.