internal storage – MY PHONE SPECS ARE NOT THE CORRECT ONES AS STATED

My phone is Huawei P20 lite, its specs are said to be 64gb internal storage, 4GB ram and android 9 but I found out it was false on mine, the system settings state the above specs yet other apps like xender read it as 1.65gb space, 1.7gb RAM and android 6. I came to prove it by adding files of 1.5gb and the phone started saying internal storage full, so what can I do to take it back to the original phone specs?