Randy: if you're doing 'negatives', they'll contribute a LOT to the experience of soreness.
It's a tradeoff . . . negative reps are almost always possible when you can't do any more positives, and are a great way to advance pretty quickly in an exercise where you're seriously lagging. (Best way I know for someone who can't do a single pullup: get to the top and do a controlled descent . . . when you can make the descent last for 10 seconds, you'll be able to do a pullup).
But . . . lots of studies have shown that negatives are associated with greater degrees of microscopic muscle 'damage' (which, when it heals, is stronger) . . . and they definitely give you more delayed-onset muscle soreness than 'regular' or 'positive' contractions.
So . . . consider laying off those if the soreness is impacting your ability to do the next day's workout.
Oh, and a belated "Welcome to CrossFit! (Here's your icepack and ibuprofen.)"