Please help with my conundrum

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This isn't related to AirVPN specifically but VPN in general.

 

Today I was helping a friend get openVPN setup on a router. Main purpose is to be able to access Hulu from our location.

 

He also has 3 ISP lines into his apartment, two different ISP. He has a subscription to another VPN service - not Air.

 

I get the VPN running and soon enough Hulu is accessible.

 

Then we switch the router to use a different ISP, trying to see which ISP has better bandwidth to USA.

 

The VPN connects to the exact same server. However, Hulu blocks us.

 

We switch back to the first ISP, connect to the same VPN server again, and Hulu works!

 

So my conundrum is how the ISP make any difference in this situation.

 

Can ISP tag traffic in a way such that Hulu can see it's ABC ISP traffic even after exiting a VPN?