Brassavola problem with purple leaves.

[Jos DC]

It started couple weeks ago after i hanged them outdoor, under 50% sun shade mesh. They’re doing good after first week and then some leaves have random shape purple spots/areas, especially on the sun direction. I thought they got sunburn but then alot of leaves’re still fine. These orchids still put out new grownths, now the purple leaves’re turning red and yellow. Any idea would be appreciated. I’m just a beginner even after more than 5 years growing other types of orchid lol.