nuget - What do Yellow Warning Triangles mean on Dependencies in Visual Studio 2017?

Question

I have just converted my PCL library to a new .Net Standard library and I have some Yellow Warning triangles on my Dependencies shown below:

During the conversion it brought all nuget packages across including dependencies so it could be dulicates.

How do I find out what the Yellow warning triangles represent?

EDIT

Build Logs:

To prevent NuGet from restoring packages during build, open the Visual Studio Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to download missing packages during build.' NU1605: Detected package downgrade: NUnit from 3.8.1 to 2.6.4. Reference the package directly from the project to select a different version.
MyProj.UI.Tests -> MyProj.Core.Tests -> NUnit (>= 3.8.1)
MyProj.UI.Tests -> NUnit (>= 2.6.4) NU1605: Detected package downgrade: NUnit from 3.8.1 to 2.6.4. Reference the package directly from the project to select a different version. MyProj.UI.Tests.iOS -> MyProj.UI.Tests -> MyProj.Core.Tests -> NUnit (>= 3.8.1) MyProj.UI.Tests.iOS -> NUnit (>= 2.6.4) NU1605: Detected package downgrade: NUnit from 3.8.1 to 2.6.4. Reference the package directly from the project to select a different version.
MyProj.UI.Tests.Android -> MyProj.UI.Tests -> MyProj.Core.Tests -> NUnit (>= 3.8.1) MyProj.UI.Tests.Android -> NUnit (>= 2.6.4)

Answer 1

As trite as it sounds, try rebuilding then restarting VS - and get on with your day :)