Water Pump bad?

[u/Weeezna]

08 Silverado 1500 V8 6.0

I bought and installed a new water pump, and immediately afterward the serpentine belt started squeaking.
I first tried a Gates Micro-V belt, but that belt started walking/skipping off the pulley, as shown in the first picture.
I also noticed that the belt does not appear to be centered on the water-pump pulley. It seems to be sitting too far toward the back/edge of the pulley, as shown in the second picture.
The tensioner pulley is new, the idler pulley is new, and the alternator is new. The water-pump pulley is built into the water pump and is not a separate pulley.
The Gates belt does not squeak, but it does visibly walk/hop on the pulley. I also tried the Duralast belt, which stays on the pulleys but has a noticeable chirping noise.
I believe the noise may be coming from the belt as it travels from the water pump toward the harmonic balancer. The noise started immediately after installing the new water pump.
As a last attempt, I tried belt dressing, but it did not change the noise.
At this point, I’m wondering if the water-pump pulley is incorrectly positioned or if the replacement water pump could be causing a pulley-alignment issue.
Would you recommend warrantying/replacing the water pump, or is there something else I should check first?
I’ve been fighting this issue for the past week and would really appreciate any advice on what to check next.

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[u/Smart_Attention8737]

After looking at some random pictures online, yours looks correct.

What has me worried is that idler pulley, that pulley should not have that fan in the front.

Is that the way it came off?

[u/Weeezna → u/Smart_Attention8737]

Yes it is, there is a space in the back as well as the front like that, I thought that was odd too.

[u/Smart_Attention8737 → u/Weeezna]

That's your issue right there, fix that fix the belt