Issue setting ranges in scenario

[Spledge]

I'm attempting to build my first scenario.

Purchased units (won't say what kind other than they are inf types) with their ranges set during deployment are insisting at firing on opposing inf types beyond the range set. Other inf units in the area with ranges set during deployment and with what is likely similar LOS on enemy forces seem to follow their firing guidelines.

Any suggestions for how to reign in these misbehaving units that are under computer control?