Edges of orchid leaves turning light green

[Hrhemmac]

The edges of my orchids’s leaves and sections of the leaves on its two keikis are turning light green. I don’t know what’s causing it because a sunburn would start turning the entire leaf yellow and brown.

This particular orchid lost a lot of its roots after I repotted it and has been struggling since. All of my orchids (phalaenopsis) are in the same spot but the color change around the edges is the most noticeable on the pictured orchid (first two pictures).

I don’t know what’s causing it or how to fix it. Any suggestions?