This might be related to the ACWebBrowser.exe. This is a part of the Maya desktop app which comes with Maya. While it usually doesn't do much and just chills in the background it may be causing this specific issue.
I am currently running Maya 2018 and Windows 10 and if you navigate to C: >Progam Files(x86) >Autodesk>Autodesk Desktop App you will see a folder named AcWebBrowser.
As long as Maya and the desktop app aren't running (kill them in Task Manager if they are) you can delete the folder and then see if they still appear when launching/running Maya.