Resetting outputted HTML markup to default? I am trying to fix a site, which I did not build nor 'break'. 

On a clean install of Drupal, the markup for a node's textfield, set to display inline, looks like this:

&lt;div class="field field-name-field-foo field-type-text field-label-inline clearfix"&gt;
  &lt;div class="field-label"&gt;Foo:&amp;nbsp;&lt;/div&gt;
  &lt;div class="field-items"&gt;
    &lt;div class="field-item even"&gt;Bar&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;


On my problem site it looks liike this:

&lt;span class="field-label"&gt;Foo: &lt;/span&gt;
&lt;div class="field field-name-field-foo field-type-text field-label-inline inline"&gt;Bar&lt;/div&gt;


I have turned off the custom theme and I have disabled the Display Suite module, cleared all caches - no change.

Are there any other obvious places I could look to find what is changing the outputted markup?

There are 250 modules enabled, so turning things off one by one is not really an option.

Thanks.
Yes, it was the configuration of the fences module. I needed to cancel the override in the first section. Navigate to Fences configuration to change the settings.