Hierarchical Select reset when I click add another item I have a custom content type that has an unlimited field. This field is from field collection type and it contains a field that is from taxonomy type and with a hierarchical select widget. When I want add a node of that type and choose a value for hierarchical select field and then click add another item the value of the hierarchical select will reset. What is the problem?
Temporarily I fixed it by rearranging the hierarchical select field at top and add another item field(image field) at the bottom of that field. 

You can rearrange the field under Mange Fields.