Liliana, Catasetums generally develope a new root system each year coming from the new, developing bulb. The plants are quite dependant on this root system. As you repotted (wise move with possible snails, they adore succulent Catasetum roots and shoots), the new root system was damaged and, although it will attempt to recover, there is not that much time left in this growing season. I believe this is why you are seeing premature shriveling.
Now, as the plant has not shed its leaves, it is not done for this season. Do water it, but carefully, in that it gets to dry between waterings. Still, some moisture at the roots is best until all leaves have yellowed and fallen. After that, you can leave the plant 'just dry' until new growth starts in the Spring. Your plant is actually a bit ahead of itself, as most of mine (Monnierara, Fredclarkeara) are just starting to spike. I suspect yours was a recent import from either Hawai'i or Taiwan, maybe southern Cal. and used to warmer, sunnier conditions. It is still adjusting. Where are you in the US? I'm in Germany, so think Canada sun.
In short, I think you are doing everything right. Next season you may have a huge plant developing, as this one is healthy. I would suggest a clay pot, if you want extra weight for the growing plant next year. Repot after the new roots are a few inches long. Coarse bark and sphagnum are my preference. You'r current pot is a touch larger than the plant needs, but no big deal. With plastic I always underpot to prevent media rot.
Hope this helps. You plant may flower again this year after leaf fall.
Jamie
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