Not sure it is much different than what the other models do since this is an elongated almost double barrel situation. It is not as much that the Low is moving wonky, the model is just keying on different areas of it at different panels. Makes it appear to go the wrong way at times. Some emphasize a coastal wave taking precedence while others, like the GFS, keep the flow coming from the southeast longer as they emphasize the northern piece. This is why the Icon shows the low going well south of us yet we still lose part of the column...the low is both south and north of us in my humble opinion.