Its got humidity problems(when it is in spike boost the moisture and humidity=youre lucky you didnt have bud blast) and you must put it at the center of the window where it gets brighter light....adjust the wires of the other plant so all your Vandas can fit and share the window. Exchange the position of the Phal with the Vanda....that position where you put the Vanda is the ideal position for the Phal....
The adriatic sea provides you with humidity and moisture in the form of fog and thick clouds nowadays....
also, study vase culture it will be advisable for your grow zone or else you need to water that vanda everyday and twice a day on warmer months....
invest on electric heater, humidifier and small oscillating electric fan....
Vandas love warmth, humidity and bright light....
you may soak it weekly for 5 min in fertilizer alternated with seaweed mix