Aerial roots stop growing beyond pot?

[orchidlauren]

Hello, I have a reoccurring “problem” with my Phal. orchids, Once an aerial root reaches the brim, or continues growing not too far from the pot, it stops and withers away. Am I doing something wrong? There’s a humidifier that runs half of the week, and my orchids are watered about every 1-2 weeks depending if the medium is dry enough. I would love to have my roots grow everywhere. Here’s a picture of my 2 orchids for reference.