Reversed side views?

Why is the Left View called Right View and Right View is called Left View?
If I choose Right View, I'm looking at object's left side (at -X). And vice versa. Is there some setting I accidentally could have changed, or is it a bug?

I have seen this topic discussed since I do 3D. The way Nvil displays view corresponds the way CAD programs
deal with this and here users can be extremely nitpicky about perspective, projection and conventions.
In a right view you are looking at the objects left side but you are looking to the right side.
So the underlying convention is not "from", but "to".

I just checked an older version (2013-Dec-17) and side views are swapped there too. So you're probably right.

But if this is the case, then why isn't Front called Back and Top - Bottom? Only side views are reversed.

This convention has long seemed unintuitive to me as well.  In fact, it actually comes from an international technical drawing standard (read about it on the following wikipedia page: https://en.wikipedia.org/wiki/First-angle_projection .  Other 3d software applications you're likely to use operate the same way, including 3ds Max, Blender, most any CAD you can think of, etc.