Page scrolls on its own after opening a lightbox image. <a> tag and id involved.

[Miguel2013]

I have a webpage on my site drawings.html with a lightbox using <a> tag to open and close the image. I click on one image that has an <a> with an href="img7" and it opens the same image just larger with an href="#_" so when I click anywhere on the screen the picture dissapears cause of the href="#_" tho there's a bug.

I can keep clicking on every image in the page to open and close them fine, but if i happen to reload the page that now ends with drawings.html#_ i click anywhere on the page the page scrolls a bit, how can I fix this?

this is the website I'm on now (same code)
http://psychgirls.epizy.com/drawings.html