Sticky sidebar html widget problem

Hi, thank you for a great and fast theme. I am enjoying it a lot atm.

My problem is with the sticky sidebar. I searched the topics and found this code for a sticky sidebar and used it:
@media (min-width: 769px) {
.right-sidebar.one-container .site-content {
display: flex;
}

.inside-right-sidebar {
height: 100%;
}

#custom_html-8 {
position: -webkit-sticky;
position: sticky;
top: 80px;
z-index: 100;
}
}

I use an html widget as you can see on the screen shot and it sticks: https://i.imgur.com/yJ8lCne.jpg

But the problem is, when I scroll down the page, the adult or child number drop down menu is not working. You have to be at the top of the page for it to work, is there a solution for this please?