There are a few concerns visible to me.
The most glaring are the 360 degree viewing windows in the cage. I'd cover the back and sides to add some security. The snake has very little privacy even with a hide.
As mentioned a smaller hide would also be a good idea, add a few and a little plant clutter.
It is a very typical sign of stress when a snake retreats to a back corner of a cage and curls tightly. We are all aware they like smaller, tight places but your setup has extremely limited options.
The room is bright and the cage isn't private. You can easily fix that by covering the sides.
I don't have any pictures of the glass tank readily available but I used a jungle picture background on the back and sides and then used thin, foil-like insulation behind that, and under the tank as well.
The changes you made may seem minor, but the snake senses something different and likely doesn't feel secure enough to adapt to things just yet.
If that snake is younger, it is even more crucial that you make things a little more private.
Not the end of the world, it is actually an easy fix.
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