Phals (and other orchid types) like to explore with their roots. More than once I've repotted Phals and discovered that more of the roots where outside the pot than inside! Wasn't a question of medium quality, just that the plant felt like doing its own thing. Sometimes all those roots are a pain to deal with on my shelves, but I let my plants do what they want.
The photo is a perfect example of this. My Phal gigantea seedling is clearly feeling 'nope' about the whole living in a pot thing, and has now firmly mounted itself to the saucer under the pot.