Looking at those screenshots, two things immediately stick out to me.
CPU: The CPU is being reported as a Mediatek Snapdragon 870, with 10 cores. The Snapdragon line is from Qualcomm, not Mediatek, and is an 8 core processor. That's an obvious sign of fraudulent tampering at the system level.
Display: You didn't mention anything about the display, but I noticed the two apps are reporting different resolutions. That's another sign of tampering.
The storage amounts are being reported the same as advertised, but that isn't trustworthy. As B. Diddy mentioned, these scammers can still make it so these apps are reporting the wrong info. Sometimes they are successful to the point you have to tear down the device and examine the physical chips to uncover the truth. I'm normally not a betting man, but I'd make an exception in this case that the storage full warning is correct and you don't have 1TB of storage in it.
If you are still within the return window, I would do so.