Losing health after selling items?

I noticed that sometimes when you sell an item that's not related to health, such as a ruby crystal, it takes away a chunk of your hp and I end up staying in fountain to regen that hp. This only takes up a tiny portion of my time, but it just kind of wierded me out when I first noticed it. This isn't a new thing either, this is something I noticed happening even when I started playing. Is it just me, or has anyone else experienced this as well? And before accusations are made that it may have been a lock on ability that chased me to spawn, It's happened when i've been sitting in base for a while, though, so from my experience it only happens on occasion when selling an item.

Thanks for your time and consideration, genuinely curious if I'm the only one experiencing this.