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I tested it and it has to do something with the html element of list i quess. I remember when my attempts to fix it in java htmleditor and it was working very weird. The <li> and </li> elements inserted into document added newline. Maybe it is similiar to this in some way.

themes->themesettings and there : 
lister_choices {
         gamebook_choice_list_style = inline_no_question
         gamebook_choice_list_style_mobile = inline_no_question
      }

When i set this as no_list, inline or inline_no_question it works, no additional newline inserted after entering invalid choice.
When i change it to : default, list, numeric_list, numeric_list_always, alpha_list it adds newline after entering invalid choice.

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. 

I can't look at this for another couple of days (travelling between continents). I will try to look at it asap though, although it could be the weekend,

Please try beta 55k.

Working like charm now. Thanks for the fix.