Hi, I worte and would like to share an authorative Prolog formatter. Had a nicer message, but seems I can only write 2 lines of text as a newly registered. Link to repo: github:exlee/prolog-fmt. If there’s interest I’ll share more (and maybe 2 line limits will be gone, too) 
Your issue should be resolved now.
Please let me know if you experience any further problems with the forum.