this is because when you charge the battery to full, it will lose the amount of charge it can take so the amount of time at 100% is as small as possible and the phone lets the battery run down before resuming charging.
What you can do is called bump charging whereby you unplug it for a minute, plug it back in, go for a shower/ have breakfast or something, come back and it should pretty much be at 100% although this can make the life of your battery shorter in the long-run
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He who receives, should thank, he who gives, should be silent and if he sees no reason to give thanks, the fault lies in himself 
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