It might be more clear if it were singular, Total Level referring to one thing with a value of x. As is, you could argue that if your level is x, then you have x levels, so either work technically. I know some people were helping clear up translations, but I don't know if they kept doing it or only pointed out what they found at the time. The dev is open to help in that regard.
The info page for Rebirth tells you all about it.