Negative zero? (White Giant)

When I signed in today I found an immediate buy order for my country for *zero* attack helicopter missiles. I checked my offensive weapon inventory and found I had "-0" (yes, that's *negative zero*) attack helicopter missiles.

Also, why are they called "Helicopter Land Missiles" on the offensive army page and "Attack Helicopter Missiles" everywhere else?

this usually happens when you have very few of these
basically your consumption rate is a fraction
buying more helis will resolve this

Its just sloppy programming.

No idea why they changed the name of attack heli missiles but they did change Offensive anti-aircraft missiles and batteries to Off AAM and Off AAMB, (to make it clearer?). Maybe a translation thing with the designers being Dutch.