Alpha version on Google play override product version

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http://stackoverflow.com – I had an application released on GP. Now I want to upload a new version and test it before users will be available to download it. I've uploaded alpha version with setted test group. But somehow everyone has got possibility to download alpha version and the product version has been overridden on GP. I think I missed something simple but cannot find what. Has anyone got such problems with alpha version uploading? (HowTos)