What is the grey panel underneath my product page thumbnail images?

Site URL: https://encore-refresh.squarespace.com/shop/p/12-wilson-dx2-soft-pearl-grade

Looks like a scroll bar... but it's unneeded as there's only three images....

How do I get rid of it!

See attached image or view page at

Password: golfballs

https://encore-refresh.squarespace.com/shop/p/12-wilson-dx2-soft-pearl-grade

thanks @tuanphan that seems to have done the trick.  just out of interest, do you know why that grey bar is there? Is it a bug?

10 minutes ago, ColinB said:

thanks @tuanphan that seems to have done the trick.  just out of interest, do you know why that grey bar is there? Is it a bug?

Yes. Maybe bug. It should be appears if too many thumbnail images.

OK, thanks @tuanphan