The Google Play store masks the icons of the apps that's why you are seeing those white frames around them. and i think that the site is not updated with this masking feature.
Original icon assets that have not been updated per the new specifications will eventually be migrated to legacy mode and scaled down 75% to the keyline grid size (512 * 0.75 = 384px). (From Documentation)
Have a look : Google Play icon design specification
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