State tax filing

Alright, plot twist: I tried removing a W-2G form for a gambling win I won in MICHIGAN, the state I live and work in, and that also affected how much I owed in WISCONSIN, a state I have only ever visited a handful of times. That's not right, is it? Why would winning money in Michigan, my home state, affect my tax refund in Wisconsin? I don't live in Wisconsin. I don't work in Wisconsin. I don't even think about Wisconsin most of the time. (No offense to anyone who lives in Wisconsin.)

 

It's almost 3 in the morning where I'm at and my brain is fried so if anyone has any ideas why this is happening, please let me know. It's probably something obvious and I just can't figure it out.