Hi and welcome to the forum!
I fear that the tables are in fact picture. Can you upload a sample file (see How to attach a document here
)? If not, save the file as .odt, open that new file with an archive manager and check the /pictures sub-folder, you may see the "tables".
AOO 4.1.2 on Xubuntu 16.04, (Xenial Xerus) and PortableApps port 4.1.2 on Windows 7