they dont spawn when I cast, well they do eventually but I make like 10+ attempts to make it happen. I do it at all ranges. Right at my feet, way out far(when it usually works).
The mana will act all kinds of ways. I charge up to cast and it depletes then stops depleting(with mana to spare). Sometimes after the failed casting attempt it bounces back fast. Sometimes after the failed attempt it recharges at used mana speeds.