SHALL I REPOT THESE ORCHID PLANTS

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Cattleyas and some Dendrobiums should almost be dry before watering again. This is thru to the bottom, not just on top. That could be why the roots are rotten and even why some buds dry up-because there are not enough healthy roots to support them. I would be tempted to move at least one or two Cattleays into some bark mix and see if that works better for you. If it does, then you can move more later. I agree with others that the media looks wet and maybe broken down. Cattleya bulbs often get wrinkly with age. Often only the newest one is plump as in picture #2 of the 2nd set, new ones look plump and old ones are wrinkled.