Ok, I thought THIS season's CYA disappeared. It's very normal for last season's to vanish over the winter even when your pool does not become a "science project". Mine does and my water is still clear.
OTOH, if you backwashed not long after you poured the CYA into the skimmer, you could have backwashed much of your stabilizer into the storm drains.

If your CH (Calcium Hardness) levels are low, there's no reason you cannot chlorinate with Cal-Hypo, and 68% is the good stuff. 48% (what WalMart sells) is worthless. Just don't pour in Cal-Hypo and bleach/Liquid Chlorine at the same time, and don't use Dichlor or Trichlor with Cal-Hypo at all.