Drive4it...I suspect it's a quirk of the BHX dep board. The flight operates BHX-JSI-KVA-BHX so there will be pax travelling BHX-JSI and BHX-KVA. The dep boards get confused with the bit in the middle that essentially has 2 flight numbers, one for the outbound BHXKVA pax and one for the inbound JSIBHX pax.