Yes, it's on my Mac that I have this issue. Can you please clarify by what you mean that if I'm on Facebook webpages, "then the icon for the website is going to show on every tab that's normal." Do you mean if I have one webpage up that is Facebook, but have other tabs open that are non Facebook pages those non Facebook tabs (websites) will also show a Facebook icon on the tabs even though they are not Facebook websites??
Here's what I've run into for example: I will have looked at Facebook, then use that same tab to enter a new web address like Youtube. So I now have only 1 tab open and it is on Youtube. The Facebook icon still shows on the tab instead of a Youtube icon, even though I no longer have a Facebook website up. Then I make a new tab for example, my local electricity webpage. This new tab I have also shows a Facebook icon. So all three tabs that are open show a Facebook icon on the tab, even though none of the tabs open are a Facebook webpage. The icons show on the tab at the top, on the left of it's description ie: Youtube. I will try clearing my history but cannot at this time.