after submiting the project to app store ,why appstore image(512*512) geting glass effect?

After submitting the project to app store, why is the App Store image(512*512) shown with a glass eff开发者_如何学Goect?

My original image does not have a glass effect, but after uploading, it is getting a glass effect. How can I avoid this glass effect?

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That is done by default, just like it's done to your app icon. Take a look at this

When creating an iOS app (Xcode), how can I turn off the automatic icon 'gelling'