Unresponsive phal

[alpha_betta]

Hello all, I am new here, have visited before looking for information but now I have a problem I'm not sure how to solve.

I bought a phalaenopsis Orchid in march and made the mistake of not repotting right away. I left it go until the end of may and found it had root rot and some kind of black coloring to the joints on the roots and bottom of the crown(I think it would be called the crown). I removed all the dead roots, left the ones that felt firm and repotted in bark. None of the roots had healthy tips, they were black and ragged. The leaves however were green and firm

Besides this plant, I have 4 other phals, all have shown some kind of growth activity since april and are still growing. Two were repotted at the same time I repotted the problem phal and did not seam bothered by the repotting. But now I am concerned, all my plants are working on new leaves and most have new roots, but not this one.

I repotted it again today, to get a good look at its roots, there seams to be no new rot, but no growth at all. One of the lower leaves has started to wrinkle and go soft, the other three are fine. I have been fertilizing all my phals the same (when I remember to do it) so I have not been treating this plant any different. It is getting sticky residue on the underside of the leaves that one of my other phals has, as I understand from reading the forms this means the phal is happy?

I am not sure what to do, or if I should just leave it alone. Any thoughts?

Thanks!

P.s. Will have photos later today... just have to fix them up a bit.