Sounds like they had shut down PreCheck so they could use the belt/metal detector capacity for the large crowds.

I went through on Saturday mid-day, and while the terminal in general was a sea of humanity, the security lines were not long at all. Pre-check was even shorter, so I went through twice. (Exited airside looking for somewhere else to eat because Miami Subs had 50+ people in a nonmoving line -- MAN does that terminal STINK!)

Neither time did I have to take my laptop out, but for some reason on the second time through the agents saw something in my roll-a-board that they didn't like and they had to open and search my bag.

While I certainly appreciated the PreCheck, it seems odd that they offer it at FLL, which usually has a very low percentage of elites (lots of Kettles visiting Grandma or going on a cruise).