An individual gene in different peak of GISTIC

Hi

I am tracking a gene in GISTIC from my analysis and a paper on the the cancer and basically the same raw data, but I am seeing some genes like KRAS, ERBB2, etc location on peaks are different in my GISTIC output and that paper

For instance in my data

KRAS chr12:25340002-26090000 12p12.1

In the paper

12p11.23 2.9593e-26 4.2718e-26 chr12:22440282-27280000

my -ta and -td in GISTIC has been 0.5

Actually I don't know how to explain this

Can you help me?