No, not 100% sure, but in my experience the ones I've worked on only seem to do this if it's a cutting that's desperately seeking water, or a potted jade where the roots in the soil aren't getting the plant what it needs, typically because of either over or under watering (and over watering is much, much more likely than under). There may be other situations that cause it to happen, but that's when I've seen it happen consistently.
In this particular case, given the very organic looking soil, my first guess is always over-watering since that's the #1 thing that people mess up when they start working with these - they treat them like other houseplants that actually want to sit in moist soil, and jades hate that. You really need to let them dry out in between waterings, which is why organic soil sucks for them - it becomes hydrophobic after every wet-dry cycle, so watering becomes more difficult than it needs to be.
Also, fwiw, OPs plant doesn't look like it's in a high humidity environment to me. Indoor environments are usually fairly dry unless it's a tropical greenhouse or something, but I'm guessing that's not the case here.