This is about the 10th time now that I have googled something "MONyog" related, clicked on the link, and it takes me to some site that is not yours.
If I click "back", then re-click on the link, it always works.
I have seen this on multiple computers, so it's not just one computer of mine that has some issue.
Also, this only happens to me from your site, no other site ever, so I really think you should have your site scanned for malware, as there is definitely some strange issue.
I would say it's been going on for the past 6+ months.