Worklist in CRM WebUI: wrong values in dropdown list

Hi there,

when I open the worklist the first time, the dropdown list shows "wrong" values to criteria "Assigned to":

Those wrong vlaues are actually the values for criteria "Belonging to", but not for "Assigned to"!!!

Only after an action by myself (e.g. execute search which occures an error or adding one more search criteria), the Dropdown list shows the correct values:

Can somebody tell me, why the correct values (Me, My Groups, Kronprinz) are not shown in the beginning when I open the worklist?

Why does the values of "Belonging to" appears instead of the values of "Assigned to"???

Here the corresponding configuration of the business role (ZSOLMANREQ) in WebUI:

Thanks in advance

regards

Edgar