phragmipedium root rot from overwatering?

[bulblehead]

Hi!

I have a phragmipedium peruflora's spirit (kovachii x eric young) i got about a month ago. It got some damage through shipping and then the tips of some of the leaves are brown.

It wasn't doing like... amazing so i decided to check the roots, and while some of the outer roots were alive and growing, a whole bunch of roots near the center were dead

Just wondering what could cause the roots in the center to all die. Not sure how long they've been dead either. It's growing in big perlite and big bark pieces. I water it every 1-3 days or so, if i see the top barks dry. I read that they like being watered a lot (using mostly distilled but flush in the sink once a week)? so I'm confused if it's overwatering that caused this because if it were other plants i'd guess overwatering. Also i don't let it sit in water.

Any help/ideas would be appreciated! Thank you!!