The mount moves as it is designed to move in order to be able to track where the sun should be, not according to its visible light. That's why it continues to follow the sun by pointing at the ground, because that is where the sun is.
It continues to rotate the way it does because it is locked on that axis, not because the sun is actually on the other side of the 'globe'.
One could lock the telescope to any axis.
The sun comes back around from making its circle and the telescope is locked to that axis still, it can't rotate any other way than it is locked to.
The sun rotates in a large circle going far enough away that night ensues, then it comes back around bringing dawn and a new day.
That telescope is set to line up with the initial light it gets from the sun, and to stay on that set axis.
Being locked on that one axis it can do nothing else but rotate that way.
We can take two circular pieces of cardboard about 2 feet wide or so,
and make some 2-4 inch holes in both, in the same spots,
drawing dark circles around the holes.
If we take those two pieces, and hold one up above the other outside,
using the sun as a far away light, we will be able to line up the sun rays with the holes of the bottom piece,
because the sun is very far away from our cardboard pieces, the light can come straight through.
If we take our cardboard pieces inside and use a closer light, a flash light or close sealing light,
we will not be able to align the light with the holes, the rays will tend to spread out, because the light is more local, closer to the cardboard.
The sun is a local light in the sky, we can see so due to the rays that penetrate the clouds, they spread out,
and a video of us flying right by the sun at 28000 feet is above in this thread. The sun is not 93 million miles away outside of the sky.