After loft multiparted body how to combine?

Hi after lofting the result is a multiparted body that can not be unioned, no overlapping parts and it can not be facereplaced to connect with something. How can I make a useful body out of the loft please?
Did I do something wrong when lofting?

Ive had this issue also

Yeah should be one piece object after a loft but the guide lines seem to separate.