WMA reads internal memory as wrong size...

WMA reads that I have 7g of stuff on the fuze +. However, the Fuze + says I only have 3g of stuff, which is correct. Is there a way to get WMA to read my Fuze + correctly? If not, will WMA allow me to add more onto my Fuze + ? (I have an 8g w/an 8g micro sd card.)