Color Problems in Lightroom Classic

It's not Lightroom that diaplsy incorrect color, but the viewer you use. On Windows 10, the Photo application is not color managed wich can leads to what you observe, as Per said.

A solution is to use the Windows 7 viewer wich is color managed. It is still present in Windows 10 but not activated. See how to activate it.

I'm going to guess that you are on Windows, have a wide gamut monitor, and are viewing the exported images in an application without color management, like the Photos app.

If this is correct, the answer is to use only color managed applications to view your work – it's a must if you have a wide gamut monitor.

You can use Adobe Bridge, which comes with your subscription, or a third party color managed image viewer like FastStone, which is free for personal use. 

Color managed applications, like Lightroom, Bridge or FastStone use the monitor profile to display correct colors by converting image colors from the document profile to the monitor profile.

Applications without color management do not do this conversion, and will not display correct colors, and will inevitably display over saturated colors on a wide gamut monitor.