Error on the access grafic

Hello 

I have a grafic with a tendence line but the grafic is wrong

This is my case:

I have a grafic with a tendence line but the grafi worg
X        Y
2      29,9
28     64.4

y=16,263Ln(x)+29,667
in the excel simulation the equation is
y=13,458Ln(x)+18,672