I just provide some solution, if possible, you could test it in your side:
(1) Just create a new blank solution, and then add all projects to this new blank solution.
(2) Please make sure that whether all web projects have the same issue in your previous solution, if just the specific web project in this solution has this issue, maybe you could remove it and add a new one directly.
(3) Just reset your VS settings:https://msdn.microsoft.com/en-us/library/ms247075(v=vs.100).aspx, and then re-debug your project, view the result.
(4) Since you set the property "Always Start When Debugging=False", like my previous suggestion, please make sure that you don't set several projects as the start up project in your side.
