I attached a screenshot demonstrating this behaviour very well because of another flaw: a grenadier firing smoke-grenades after finishing his normal grenades.
In the picture you can see a grenadier and an enemy Ifrit. Besides that, you can see three different smoke trails just in front of and more in the distance to the left of the Grenadier.
This is the grenadier trying to fire grenades at the APC but instead firing (smoke) grenades in different directions.