This sounds like scratch grains instead of a complete poultry feed.
When you get a chance, look at your bag or find it online to look how it's labeled.
It would be good to give your pullets a complete balanced poultry feed like layer feed.
It would not be normal to have a droopy abdomen between the legs, especially for 6month old pullets.
What type of food/treats do you feed?
Do these girls lay eggs?
Swelling in the abdomen can be from reproductive problems or excess fat in the abdomen. I would make sure they were eating their...