Make sure you have the Element Index set to the emitter index value, right now there is a limitation with Cascade/MIDs and Blueprints are working to fix, which might break your setup if you sort/change the draw order in Cascade.
Your Emitter Index starts @ 0.00 on the left and increments up from L to R.
If you have more than one Emitter, you need to set an MID for each Emitter in your system.
If you only want to change the colors of your Effects I suggest giving an instanceParameter a try instead using InitialColor and ScaleColorOverLife modules, it requires far less setup.