Welcome to the Avenue Katie
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Do you mean this spot?;
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That is where the cloaca is (where poops come out). You can usually see some sort of separation in the feathers where they´re not as flush as other places.
How old is your bird?
Sounds like a normal moult, down feathers and a few flights. Sometimes it can look really bad and there will be so many little whispy down feathers around the floor you might panic a little but when they are in full moult it will look like that for a few days.
You should only worry if they drop all their flights at once, all their rump or tail feathers at once, or you see fuzzy patches on your bird where it´s only down feathers and no others over the top. Bald patches etc.
Sometimes the feathers can get a bit scew wiff, but they will sort themselves out after the moult process is over.
edit; Just to add, the clip on the right in the first picture is not closed properly. Just have a check on it and close it if it is still like that.