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I've done a bit of very similar photoraphy myself from polluted skies in Sydney so I can tell you yeah it is pretty normal unfortunately.
I can't speak to filters, but you can remove it in processing afterwards. I have done it in Photoshop with a plugin i have on trial called gradient remover, but most processing software will do it with some degree of success just google guides on removing sky gradient for whatever software you're using.
Biggest tip I can give you, apart from go to a darker location, is shoot the milky way when it is directly overhead where possible rather than lower in the sky. The lower it is, the worse your gradient will be from a light polluted location. From your picture and the foreground object in it, I would assume it was fairly low in the sky.
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