My Phone Storage is supposed to be 16 GB but it reads 8 GB

My Phone Storage is supposed to be 16 GB & it is supposed to be free because I just got it a few days ago yet it's full & you can't even know where the data is distributed
there is more than 8 GB that's missing in air
I tried most of the known apps to clean or to remove cache & nothing happened
there is an app that I installed once & didn't start up saying that the phone is rooted
so I downloaded root checker & it said that it'sn't rooted properly
then I used Storage Space app & it said that the phone is only 8 GB
& all the apps say that the phone is only 1 GB Ram
What do I do is the phone rooted or not or is it rooted non properly or is it damaged in storage or what
It's Huawei G9 LTE it's read in many apps U2 or Honor something
here is pics of every information about it
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