Disappearing HUD elements

Sometimes certain HUD elements (such as circles, ammo icon and Loading/Saved) disappear, just like if I was in the menu.

This happens often when I use crossbow.

Also, if I’m really correct, in HL2, all HUD elements are hidden when in menu, but in BM I can see health, armor and ammo counters.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.