PoB Full DPS not matching In-Game DPS for Artillery Ballista (PoE 2)

Hi everyone, Does anyone here use Path of Building? I'm currently using it with the game PoE 2, and I feel like the DPS numbers in the game compared to Path of Building are a bit strange.
I'm playing a Totem Artillery Ballista build. As you can see in the picture [or 'In my setup'], I have three ballistas. Their in-game DPS tooltips show 2052, 3711, and 3932 respectively.
However, when I look in Path of Building:
The ballista that shows 2052 DPS in-game actually has the highest 'Full DPS' in PoB, at 24,619.
The ballista with the highest in-game DPS (3932) only shows a 'Full DPS' of 8,668 in PoB.
The ballista with 3711 in-game DPS shows a 'Full DPS' of 11,284 in Path of Building.
But when I'm playing, I feel the in-game numbers are correct. So why are the numbers in Path of Building like this? Have I configured something incorrectly?
Thank you.

https://imgur.com/a/6JvrOO4