If after saving the article something is missing (or changed), this is an indication that there is a Joomla plugin or an editor plugin that modifies the contents of the editor on the "save event". This could be done for three reasons:
- to add automatically HTML formatting/styling (e.g. automatically change the padding of the table cells or the alignment of the images).
- a third-party Joomla extension is doing some other custom work.
If after inserting the html code produced by Tabulizer popup window you notice some changes in the contents of your Joomla editor after clicking on the Save/Apply button, it means that your editor's contents are getting modified during the save action. To be 100% sure it is recommended that you copy-paste the HTML contents of the editor (toggle editor to view it's source code) before and after saving the article and mark the differences (if any).