Web Attack

Good day, I had a website developed for me and it is also hosted at the developer. The problem is everytime I open my website my Norton gives me a high intrusion alert ! The attack seems to always come from the same computer. (See attached screenshot- please enlarge) Norton Live Support checked out my website and confirmed that it is clean and safe and suggested that I post my  concern on the Community Board. But if all safe then why do I keep getting these disturbing messages? I hope not other visitors to my site also gets these messages. It will be very bad for my intended business! Kindly please assist. Thank you!