The RS is not straight knit, it's K1, yo, K2tog, knit to end on odd rows 3-19 - if you are knitting the whole row this may be part of the problem.
I don't see anywhere where you are supposed to have only 48 st before you begin decreases, looks like last row of increases give you 49 st.
Lastly, is it supposed to be a mirror image? In the pic, the points are not quite centered on each section; since there are only 22 rows to the section, there is no actual true center row, so I wonder if it is not intended to be an exact duplicate?
"The cat has too much spirit to have no heart." -- Ernest Menaul