On the homepage if you hover over one of the links in the Recent Replies area, it puts up a tooltip. If your cursor is low enough, it touches the tooltip, which indicates to the browser that you're no longer over the link, so the tooltip goes away, so now you're over the link again in the tooltip comes back, etc.
The fix should be as simple as adding pointer-events: none to the CSS for the tooltip.
On the homepage if you hover over one of the links in the Recent Replies area, it puts up a tooltip. If your cursor is low enough, it touches the tooltip, which indicates to the browser that you're no longer over the link, so the tooltip goes away, so now you're over the link again in the tooltip comes back, etc.
The fix should be as simple as adding
pointer-events: none
to the CSS for the tooltip.