Help! Strange yellow discoloration on leaves

[Orchidreamer]

I just got two Laelia pumila's and for some reason, some of the leaves have yellowish discolorations. (Note: they were yellowish when I received them, and I don't know what the previous owner did.) Even one of the new growths has this strange yellowish tinge. The yellowing reminds me of a tie-dyed shirt, since I can see "patterns." The plants were originally planted in treefern, and I repotted them into S/H as I heard that catt-types enjoy semi-hydro.

Any idea what is wrong? Is the yellow discoloration due to a disease or a nutrient deficiency? Or something else?

Is it a serious problem?




Thanks!