Selecting through Status bar and deleting get merged with next element
I think that you removed the title of H2 but your span is still added to a section H2. You need to remove the H2 section if you want the span to be directly under body.
This issue happens sometimes with CKeditor in chrome browser, try deleting browser cache by pressing ctrl+shift+delete in chrome..
There is a opened ticket about this bug in CKEditor. there is also a fix for some cases of this bug (it will fix the problem that describe):