ZestKit setFrom() Tween - Unwanted Render Tick

/*
In EX1, my objects would render (seemingly a single frame) at the ZKpositionTo position before starting from the setFrom() position. Not every time, but sometimes.
I'm used to Greensock's (AS3/JS) Tween library and I never ran into this issue, so I may be bringing expectations over incorrectly.

In EX2, I explicitly set the from position and then only use ZKpositionTo. This works as expected.
You mentioned on Twitter that "the first tick is a 0 elapsedTime tick", and I'm assuming this may be the culprit of the unwanted frame render.
Any way to alleviate the issue? Any other thoughts? Or is this expected behavior?
*/

//EX1 - this example has the issue
foreach(GameObject tile in gameTiles) {
	pos = tile.transform.position;

	//add animate
	tile.transform.ZKpositionTo(pos, tweenTime)
		.setFrom(new Vector3(pos.x, pos.y - GRID_COUNT_ROWS_OFF_SCREEN, pos.z))
		.setEaseType( EaseType.CubicOut )
		.start();
}

//EX2 - this example doesn't have the issue
foreach(GameObject tile in gameTiles) {
	
	//update
	pos = tile.transform.position;
	fromPos = new Vector3(pos.x, pos.y - GRID_COUNT_ROWS_OFF_SCREEN, pos.z);
	tile.transform.position = fromPos;

	//add animate (setFrom() used previously, but an unwanted render tick would occur)
	tile.transform.ZKpositionTo(pos, tweenTime)
		.setEaseType( EaseType.CubicOut )
		.start();
}