Reference manager 10 and number ranges

For some reason, reference manager 10 does not want to use number ranges with superscripted brackets.

suppose I have a reference that should look like (^ means superscript):

blah blah^[1-5]

If I dont include the brackets, refman will do

blah blah^1-5

 If I do include the brackets, refman will do

blahblah^[1],[2],[3],[4],[5]

“Use number ranges” is selected in the in-text citation settings dialog. 

Any ideas?