Rodi di

So I was making water yesterday and today I looked at my rodi unti which was left out and the DI Resin container isn't full. There's about an inch of water gone. So I checked the flow of all the cartridges (by taking them off one by one) and found the micron and the carbon flowed fast. But the DI resin cartridge was only a trickle!....is that suppose to happen?!?
:doh::confused::confused::help::help: :flamethrower: :trout2: