While I was out on FMLA leave, my employer took some of my core duties away from me and re-assigned them to another person(s). is this against FMLA law where return to work duties are concerned? I was just made aware of the now permanent change on 01

While I was out on FMLA leave, my employer took some of my core duties away from me and re-assigned them to another person(s). is this against FMLA law where return to work duties are concerned? I was just made aware of the now permanent change on 01/21/2011.