Hi,
There's a few parameters in play here.
First, as Dan mentioned, there's the drop-down that lists Replen up to Max, Replen up to Need, and Replen up to Lesser of Need/Max. That's at the Warehouse Master level, though it's possible there's also a choice at the Wave level to override the warehouse default.
Next, there's a parameter on the wave that says Combine Priority 40/50 Replens. As far as I know, priority 40 means "the wave needs this quantity, and it will currently fit in the location"; priority 50 means "the wave needs this quantity, but it won't yet fit in the location". If you have the combination turned on, I think they'll all come out as priority 40 replens.
There's also a parameter that says Suppress Post-Pick Replens, on the Wave parameters. This is the one that causes the system to generate a replen when your location drops below the min quantity, as opposed to when your location drops below 0.