DNS Server Issue?

Site has Plesk backend (which I am not familiar with, and has its own DNS server configured) The site worked perfectly until a recent change. The site was converted to a wordpress format and now sits on wordpress. **Attached is a zip with a screenshot which is the tracert command from the business location. If you do a tracert command anywhere else in the world it works correctly. ** **Issue** When the site is accessed from anywhere in the world, the site appears correctly. Since the upgrade to a wordpress site, when accessed from inside the business (at the office), the site does not appear, the domain name resolves to the wrong website. If accessed anywhere else except the office in the world, it appears perfectly now... **Solution** Please advise of a solution, or say how you will do this, let me know the work involved and I will award the bid to you. Also let me know how long it will take you to do it. If you do not understand this, please do not bid. Do not contact the business, only contact me directly here.