Unable to log in to website due to security token problem

I am not sure whether this is the correct Forum thread to ask for help with my problem.

I was logged into "www.buybackmytdi.com" . I was replying to a forum thread when I accidentally closed the website.
I tried to re login and I received this error message: " The most recent request was denied because it contained an invalid security token. Please refresh the page and try again"

From then on I could no longer log into that website from this computer. Refreshing page and clearing cookies, rebooting computer did not work. I keep getting the same error message. Changing browsers from Chrome to Edge did not help.

I can however login using another computer .

Please advise how to fix this issue with my current computer.

Thanks

Problem finally solved by clearing History for the last week.