it happens literally every time unless i jetpack over the seam.

Sometimes, when throwing a grenade, then after grenade has thrown, your weapon now has this.

that happens when the grenade is destroyed before you throw it.

it also happens if your arm gets blown off before you throw the grenade

Also when you charge a grenade and switch to a weapon, then you can switch back to the grenade fully charged and throw it instantly.

Sometimes when you use AI go-to point, if you take control of the unit before it has gone where it is designated to go, it will be set to go back to starting point.