HTML5 validation outline error: heading level skipped on the captcha preference page

Validation errors in /xwiki/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=captcha
ERROR: The heading “h3” (with computed level 3) follows the heading “h1” (with computed level 1), skipping 1 heading level. at line [1101] column [128]

Extracts of the invalid content:

  1099 <input value="Save" class='button' type='submit'>
  1100 </div>
  1101 </form><div class="row"><div class="col-xs-12 col-lg-7"><h3 id="HConfigureJCaptcha" class="wikigeneratedid wikigeneratedheader"><span>Configure JCaptcha</span></h3><form action="/xwiki/bin/save/XWiki/Captcha/JCaptcha/Configuration" class='xform jcaptcha'>
  1102 <dl>
  1103 <dt>

Validation errors in xwiki:XWiki.Captcha.Administration()
ERROR: The heading “h3” (with computed level 3) follows the heading “h1” (with computed level 1), skipping 1 heading level. at line [1239] column [128]

Extracts of the invalid content:

  1237 <input value="Save" class='button' type='submit'>
  1238 </div>
  1239 </form><div class="row"><div class="col-xs-12 col-lg-7"><h3 id="HConfigureJCaptcha" class="wikigeneratedid wikigeneratedheader"><span>Configure JCaptcha</span></h3><form action="/xwiki/bin/save/XWiki/Captcha/JCaptcha/Configuration" class='xform jcaptcha'>
  1240 <dl>
  1241 <dt>

Validation errors in xwiki:XWiki.Captcha.WebHome()
ERROR: The heading “h3” (with computed level 3) follows the heading “h1” (with computed level 1), skipping 1 heading level. at line [1101] column [128]

Extracts of the invalid content:

  1099 <input value="Save" class='button' type='submit'>
  1100 </div>
  1101 </form><div class="row"><div class="col-xs-12 col-lg-7"><h3 id="HConfigureJCaptcha" class="wikigeneratedid wikigeneratedheader"><span>Configure JCaptcha</span></h3><form action="/xwiki/bin/save/XWiki/Captcha/JCaptcha/Configuration" class='xform jcaptcha'>
  1102 <dl>
  1103 <dt>