does llMoveToTarget not work within collision_start

does llMoveToTarget not work within collision_start?

I am making a script to make my object nabvigate a maze going around objects
for a project for school concerning robots and virtual reality
I am detecting the objects that my object is coliding with using collision_start but then I cannot avoid them but when my code reaches MoveToTarget the object does not move.

Does anyone know? thanks in advance.
My object is physical so I am using llMoveToTarget not llSetPos

Simple example:

vector startPos;

default {
	touch_start(integer n) {
		startPos = llGetPos();
		llMoveToTarget(startPos + <5,0,0>, 3.0);
	}
	collision_start(integer n) {
		llMoveToTarget(startPos,3.0);
	}
}

Extended example:

vector startPos;
integer testTarget;
integer startTarget;

default {
	touch_start(integer n) {
		llSetStatus(STATUS_PHYSICS, TRUE);
		llSetStatus(STATUS_ROTATE_X | STATUS_ROTATE_Y | STATUS_ROTATE_Z, FALSE);
		startPos = llGetPos();
		llMoveToTarget(startPos + <5,0,0>, 3.0);//first target
	}
	collision_start(integer n) {//I placed a prim in the path of the first target
		llOwnerSay("I have collided with something");
		testTarget = llTarget(startPos + <0,5,0>, 0.1);//second target with no obstruction
		llMoveToTarget(startPos + <0,5,0>, 3.0);
	}
	at_target(integer targetInt, vector targetPos, vector currentPos) {
		if(llVecDist(startPos, llGetPos()) <= 0.2){//at the third target/home postion
			llTargetRemove(startTarget);
			llSetStatus(STATUS_PHYSICS, FALSE);
			llOwnerSay("I am back at the start");
		}
		else{//at the second target
			llOwnerSay("I am at the second target");
			startTarget = llTarget(startPos,0.1);//third target
			llMoveToTarget(startPos,3.0);
		}
	}
}

In both cases the collision event triggers the second llMoveToTarget.