Yes, that is heat damage, and not enough watering. If you keep it against that metal wall, it will be even hotter. Even with daily soaks there isn't enough time to take up enough water.
Full sun in Florida is too much for Vandas. Hybrids with a lot of the big Renanthera species in them, and plants with a lot of Papilionanthe ancestry (called terete Vandas or quarter-teretes) can take full sun, but not genus Vanda.
Have a look at the Motes Orchids Web site. They are in Homestead. If you sign up for the E-mail newsletter you will get a monthly article on what to do then in Florida. And watch Motes' YouTube videos about growing in Florida. He grows under shade cloth, but I don't recall the density. From my recollection he waters each hanging plant every morning with a water wand, twice for each row. Then he waters again in the afternoon on hot, dry days.
He also fertilizes a lot more than you are.
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