Looks like something has eaten a bit of the leaf in a few places. I would spray for pests. And in the second and third photo it appears that the leaf tip is brown due to fertilizer burn.
These leaves will never be repaired. You can keep this from happening by flushing the orchid pot with pure water and removing the salts build-up from feeding. The parts that look like something chewed them could be caused by many different things. Sometimes plants get set too close to each other and the plastic pot will 'crunch' the leaf edge of another plant. This will result in the same type marks.
Good luck to you, Darren.