Vibrating cards

Why does ONE CARD just vibrate at me & I can NEVER clear it off the board? Usually it’s a card that is sitting sideways. Help! I have lost FOUR GAMES this way. I’m about to give up!

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@Michele_Bryan, could it be a 6 that looks like a 9 sideways? I always get those two mixed up!

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It’s showing you that you SHOULDVE cleared that card in the previous move before you turned another card , kinda like a hint