Newly repotted phal with orange balls and white moss on roots

[fourhills]

Hello, I'm new here but I've been gifted many orchids, so I've owned a few for quite some time now. I've only recently realised they needed repotting so I went ahead with that about 2 weeks ago.

I've noticed that the bottom leaves of my phals are yellowing and look into the medium and the new roots have these orange/red balls stuck on them and it looks like a white moss kind of texture is coming from it too.

Any clue what exactly this is and whether I should repot it again?

Thanks guys