Question about Relational expression of Vref and VIT- (TL7705A)

On attached TL7705A datasheet P2, writing about Internal resister of SENSE-Pin.

TL7705ACP.pdf

I substituted and calculated Vref：2.48V～2.58V (and TL7705's R1,R2).

As a result, VIT-：4.41V～4.59V.

It's difference with the VIT-(4.5V～4.6V) written on a datasheet, please let me know a reason.

Best regards,

Satoshi