Anchor tab not moving to the right section when clicked

Hey everyone,

I have an issue with my website. When I click on the anchor tab in the what we have done section, it does not move to the designated section. I tried many times, but I do not know what is the issue. I need each one to guide me to move to the right section when clicked. Any one interested to help?

For example, it shows this section, when I click on October 3, instead of showing October 3’s section.