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Wrong host header, on incoming requests from Roku/DVP

We have been serving ads for Roku devices for a long while.
We have been getting a constant stream of requests, sometimes more sometimes less, that reach our servers but have a host header of an unmatching domain
(example: say our servers domain is "" the host header would state something like "")
The requests' user agent is always "Roku/DVP-" though different versions.
The domain received on the host header would usually be a 3rd party that had most probably redirected a request to our servers, or a domain that we redirect requests to.

Is there a known issue on "Roku/DVP-" mis-handling host-header on redirects, or any similar known issue that could explain such behaviors?
Thank you
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