If you are still interested to look for the reason, here is the CSS code that cause the flickering (which is a CSS related issue).
In the theme’s style.css
a:focus, a:hover {
/* ... */
animation-name: fadeIn; /* <=== this cause the flickering, just comment it out or use another CSS to override this such as animation-name: none; */
/* ... */
}
Like @WebElaine mentions, generally if theme has problem, you may consider
- contact the author
- sometimes, maybe there is chance that you might need to overcome the problem immediately before author updating the theme, you may consider to add your own override. You could do it by using child theme and create your own CSS file.