Something else is wrong with the choices. You can download and test it from here : https://rigachupe.itch.io/adventuron-engine-tutorials and there look for file "bugged - GameBookTemplate_20200803_1605.txt"
To test the bug you start in forest. Click line 2. and you see 'just test 1' message. Click line 9. and you see 'just test 8.'. Now click 1. to move into river page. Click 3. to return back to forest page. Now there is one more option on line 2. Click 3. and it shows 'just test 3' and should be 'just test 1'. Even clicking on 1. should move to river but instead it shows 'just test 1'. Seems to me like clicking the row uses the text as if entered into prompt? Because when i enter with keyboard 1,3 or 10 it works normally.