Updating Multiple Resource Loaded Activities

Hello,

I am updating a project that has activities with multiple resource assigned to them.  However, when I update the activity with a new percent complete and actual hours - it does apply the same percent complete to indiviual resources and the actual units does not distribute evenly.  Rigt now I have to go into the Resource assignments tab and update indivual resources instead of activities.

Right now  am using Fixed Units as my duration type & units percent complete.

Any help would be greatly appreciated.

Kaitlin