Stock indexes popped higher in the first 90 minutes of trade Thursday and then stepped down steadily to a weak finish. The Nasdaq lost 0.3% after being up 1.1%, while the S&P 500 pegged a 0.1% gain. The IBD 50 fell 0.7%. Volume fell across the board. The day’s negative reversal was a reminder that this market is in correction. It’s acting like it, too: up moves in weaker volume, down moves in stronger volume.