Known bug in Gimp 2.10, the circle path is generated in the wrong direction. Possible workarounds:
1) Flip the path, using the Flip tool in Path mode.
2) Get the ofn-path-edit script where a function can reverse the direction of a path
3) Get the ofn-path-to-shape script which will generate the circle path directly. In addition, you can control where the circle starts.
The ofn-* scripts are available here. You will also find there an ofn-text-along-path script that can do things better and more easily than the standard text-along-path function.
Edit: much simpler option #1
1) Flip the path, using the Flip tool in Path mode.
2) Get the ofn-path-edit script where a function can reverse the direction of a path
3) Get the ofn-path-to-shape script which will generate the circle path directly. In addition, you can control where the circle starts.
The ofn-* scripts are available here. You will also find there an ofn-text-along-path script that can do things better and more easily than the standard text-along-path function.
Edit: much simpler option #1