Join Date: Nov 2018
Location: Istanbul, Turkey
Programs: TK Elite Plus,BAEC GGL,ITA Executive, AFKL Gold,QR Gold,HH Diamond,Bonvoy Gold,ALL Gold
Posts: 14,186
If the return is not PrimeFly but EcoFly it is correct that the system is charging you the seat selection for the return. You could mix & match the branded fares to be one package on each direction.
I am not aware of the "child" glitch but it's known that TK.com might be glitchy when opening bookings made through TA's.