Fishy RODI

[mtrcyclefish]

So, i recently upgraded my RODI system with a 3 stage di. Cation-Anion-mixed bed. Yesterday I emptied my nsw container and cleaned it out. I refilled it overnight and today it smells very fishy and has an almost foamy layer on top. No salt was added. Also, my cation hasn't changed color at all, but the anion and mixed are both completely changed. My tds in to the mixed bed is 3 and out of it is 2. Im going to change the anion and mixed, but is it normal for the cation to outlast the anion?