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It looks like you need to make sure that you're building the plugin with the VERSION property, and also putting that in the schema.json file. I think some of our boilerplates do this for you automatically.

This warning indicates that the SDK was generated for one version (each SDK embeds a version number), and the plugin binary is reporting to the engine that it's a different version. 

Is your provider open source so I could take a look at how it's set up?

Also this normally happens because you have "pulumi-resoruce-xyz" on PATH (usually in ~/go/bin because go just loves to put everything in a global folder)