Many to Many Droping Data

I have a large cube that uses many to many between a bridge table and a inventory table. The inventory data stored daily so it's partitioned on Relative Months. The current month is the only month processed daily. The bridge table is full processed daily and all cube dimensions are process update. After a Process update on the dimensions, the Many to Many query only returns values from the current month. The only way previous months data will begin to return is after a full process of the prior months partition (tried a process index). SSAS 2012 Enterprise Edition. Thanks