I see that some border states have joined the confederacy. The outline map at their website also includes West Virginia and what looks like parts of southern New Mexico and Arizona, although I don’t see that they had any delegates in attendance. Is there a flag?
Of course West Virginia is included, because it really is a part of Virginia. Check the Constitution: no state may be subdivided without its consent.
West Virginia was formed from Virginia territory during the War, while at the same time the North was claiming that Virginia had not really legally seceded.
They never really figured out whether the Southern States had seceded or not, and have followed a contradictory policy even since.