lichess for Android 7.3.0: Non-checkmated king is highlighted

Chess for Samsung Galaxy Pocket plus S5301 - free download APK

Why is Rg8+ not the correct move? According to lichess, Ne7 > Rg8+

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lichess for Android 7.3.0: Non-checkmated king is highlighted

Why is Rg8+ not the correct move? According to lichess, Ne7 > Rg8+

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Chess for Samsung Galaxy Pocket plus S5301 - free download APK

Chess King - Learn to Play::Appstore for Android

Checkmate with king and rook vs king (super easy ) Lichess.org