apps say installed but I can't find them

I've been trying to download whatsapp and runtastic for the past few months. t always gives the same reply of "installed". even to the extent of it appearing as installed on the respective websites when before I install. it also gives the response of"app will be installed later". nothing ever happens. I have tried to download other running apps thinking that maybe the problem is with runtastic. they all give the same responses

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