First, were all three photos taken at the same time? One photo shows two swelling eyes, which grow to form new growths. I don't see the longer growths on this photo. The other two photos show elongating growths, which could be those two eyes some months later.
The left elongating growth looks healthy, but the one on the right is turning black at the tip. This is often caused by insufficient water, which in turn can be caused by not watering enough, or by having a sick root system. Some people say extra calcium prevents this, but your plant's problem is roots, not calcium. That new growth will probably die back completely. There is a chance only the tip will die, leaving a stunted growth. Fortunately such a stunted growth would probably have growing points, which have the potential to make completely normal growths, with proper care.
Most Cattleyas make new roots as new growths are elongating. Yours doesn't seem to be doing this. It is possible it is one of the ones that makes new roots only after growths mature. Cattleya warsczewiczii is one such plant. This kind of plant needs careful attention not to kill the old roots before growths mature, because the plant will then not be able to take up enough water to support new growths.
It's possible fertilizer burn killed the roots, but more likely is that you overwatered the plant during the cooler winter, and the roots rotted. Or you underwatered as previous new roots were forming, and killed them before they got big enough. Or the plant had poor roots when you bought it. When the roots aren't good, or you don't water a healthy plant enough, new growths are smaller than previous growths.
Cattleyas won't make roots until they decide it's the right time in their growth cycle. Humidity has nothing to do with it. The high humidity is not to induce roots, but to decrease water loss from the leaves until new roots form.
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