ITS NOTHING TO YELL ABOUT .....
The limitations of the unit ,maybe combined with technique.
Do you have the air regulated so it’s not just blowing 100+ psi or more through the unit ?
I could speculate all day about potential issues but using high end units and never having this as an ongoing issue, I still say it’s the limitation of that gun.
Always spray your corners , seems and plugged areas first , then feather everything out to a nice even powdered finish
Welcome to Powder 365
There's nothing wrong with the plugs.
Make sure the air is at a moderate level and the cloud is soft and dense enough.
Try using bolts.