Anyone else having problems with Slingers?

[Twan]

The problem is in fact more rare and mysterious than I've imagined. I thought that a soldier not able to fire in a javelinists/slingers squad was the cause, but after dozens of tests with some triarii in a javelinist squad from EA Ermor ordered to fire closest, I must say it's not the case. In about 1/20 fight the throwers forget their javelins, in other cases they fire normally even with a pure melee troop with them.