Anyone having issues using USERELATIONSHIP and filters?

So I have a table that shows product sales. There is a purchase date and a return date as well as a field that states whethere they are within 30 days of purchase date, there is also a "Within 30 Days" slicer that I can use to filter the data by that field. So I have 2 relationships between my sales table and the date dimension:

purchase_date_key = date_key

return_date_key = date_key

The primary relationship is purchase date 

So I have 2 measures:

count_purchases := CALCULATE(DISTINCTCOUNT(order_id),ISBLANK(purchase_date)=FALSE())

count_returns := CALCULATE(DISTINCTCOUNT(order_id),ISBLANK(purchase_date)=FALSE(),ISBLANK(return_date)=FALSE(),USERELATIONSHIP(return_date_key,date_key)

Both seem to work fine but when I want to count the number of returns within 30 days of purchase the filter doesn't seem to work properly.

If I do:

CALCULATE(DISTINCTCOUNT(order_id),ISBLANK(purchase_date)=FALSE(),ISBLANK(return_date)=FALSE(),USERELATIONSHIP(return_date_key,date_key,FILTER(sale,within_30_days=TRUE)) it returns blank (it shouldn't)

If I do:

CALCULATE(DISTINCTCOUNT(order_id),ISBLANK(purchase_date)=FALSE(),ISBLANK(return_date)=FALSE(),within_30_days=TRUE,USERELATIONSHIP(return_date_key,date_key) it returns the right count but when I set the within_30_days slicer to FALSE the count doesn't decrease. 

Is there another way I can accomplish this?