You have fertilizer burn. You do not need to unpot the orchid right now, but do run lots of fresh water through the medium to remove salt build up. That is what causes the leaf tips to turn brown and die like this. After the bloom is done, then repot in fresh medium and be sure to feed properly. 1/4 strength and flush the pot with water the next time.
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Oh yeah, you can take a clean razor blade or sterilize a knife and trim the brown tips off just behind the dead part if you don't like the brown tips. Just make the cut like a "v" and it will look like your leaf again. Seal the cut with some cinnamon to keep out infection.
Also, just to be safe, spray for spider mites. The shiny silver spots could be mites, but I am not sure from the photo.