Quick question about installation options

When I install Defraggler, doesn't matter what version, I always select the following options: DON'T install the yahoo toolbar, DON'T automatically check for updates, DO add start menu shortcuts, DON'T add desktop icons. Yet, when I run defraggler after installation and go into the settings and options, there is a tick in the 'Automatically check for updates to Defragger'.

Why?