Topic: TinyMCE ruins HTML table formatting

For some reason when I paste in an HTML table layout into TinyMCE it completely destroys the layout. I can't quite pinpoint what is changing using a diffchecker... I was wondering if anyone can explain why TinyMCE is destroying the layout? It looks like it's left-aligning the source output after it's placed into TinyMCE, but that shouldn't be what reformats the markup. Anyone seen this before? I tried a bunch of config fixes in the fiddle but couldn't get it to work.

Codepen of original HTML table:

Codepen of HTML table after TinyMCE is done with it (be sure to check the source):