Product field, wysiwyg, table keeps resetting

Im trying to create a product field with wysiwyg editor, mode.
Works, however when I set the default entry to a table, with a certain html code, and create a new product, it is showing the words, but not the html editing, (table) makeup.

Im trying to make this prntscr.com/3wd4tl

By doing this: prntscr.com/3wd5zp

And it results in this: prntscr.com/3wd5n6

The html code table, is being reset by the default entry. How to fix this?

WYSIWYG editors tend to strip such HTML tags. Some can be tricked into not doing so (read the manual of the editor you're using to find out if it's possible with this one), but for most it's hopeless.
To avoid this and for your tags to 'survive', switch to the CodeMirror editor.