Iphone storage problem

Hi, I have iPhone 6 plus 128 GB, and in the last time I found some memory issues, but when checked what fill my storage in Settings>General>iPhone Storage I found that if I adding amount of memory GB of each application I will not get even approximattely amount of 100GB. Maximal size of all apps , photos that I have on iphone about 60GB, but it shows that memory is full.

You can see in the attached images that sometimes System files take about 80GB, sometimes notepad takes about 80GB, but I have not anything in notepad that may be about 80GB, also I tried to delete it but it was not helpful.

Maybe somebody meet this kind of problem and what can I do for solve it?

Thanks in advance.