Are these signs my budgies are sick?

Both my budgies (male and female) have slight brown staining above their cere and I'm not sure if this is a sign of nasal discharge?

Both budgies are very active especially when they hear other birds.
Poop is normal.
They eat frequently and drink daily.
They have daily exercise outside their cage in my room.
They have a cuttle fish bone which they frequently chew at.
They're always at the top of the cage. Male only sits on the bottom perch when the female chases him away.
They recently had a honey budgie treat bell in the cage (which they ate)
No fruit in the cage.

Please help?
 
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