Trigger load bug

[pollo]

Hi all! I come to you again to see if you can provide me with some light to this bug

I've been working in this zombies' map for the last months. It's detailed, with lots of sounds and cool stuff, but this "bug" kinda kills it: some triggers are not loaded (they are invisible) until the player is near it in a certain position, like I illustrate in the vid below (it just loads in the moment I crouch and go to that corner). I've done a rough count of trigs by doing

		getent("classname", "trig...").size 
	

for each type of trigger, and it shows I have 53 triggers. I tried removing some triggers just in case I hit a limit or something, but the same problem occurs; and what kinda surprises me is that some new triggers I make, they work, but those ones that fail to load, keep like that

Any idea what this could be?

Thanks for reading!

PS1. Trig hurt - trig multiple (for minefield) mostly work good, I havent seen it happen for these ones; the problem are trig_dmg and trig_use_touch