Stinger Pistol got nerfed?

After the CO-OP update, I have noticed the change of stinger pistol.

Before the update, stinger pistol's damage over time can be stacked.

And, now, it is no more.

But the stinger pistol's bullet damage itself was buffed.

Hmm.. did anyone notice it? 🤔

Stinger Pistol

[Before the update]

 Damage: 5

 Damage Over Time: 3/sec

 (It can be stacked)

[After the update]

 Damage: 30 - 10

 DamageFallOff: 10m - 30m

 Damage Over Time: 3/sec

 (It cannot be stacked)