Problem with the editor messing up the code

Hello!

I hate the editor because it is hard to work with when I am adding custom code. Often it messes the code up.

For example look at this:

In the editor it shows like this:
Norton 3X Contour Sanding Sponges (a href=”https://blog.funnybunny.se/wp-content/uploads/2009/08/allaboutew_yellowsponge.jpg” title=”Yellow sponge” rel=”lightbox[001]”)yellow(/a) and (a href=”https://www.funnybunny.se/wp-content/uploads/2009/08/redsponge.jpg” title=”Red sponge” rel=”lightbox[002]”)red(/a)

But on the page itself it looks like this:

Norton 3X Contour Sanding Sponges (a class=”cboxElement” href=”https://blog.funnybunny.se/wp-content/uploads/2009/08/allaboutew_yellowsponge.jpg” title=”Yellow sponge” rel=”lightbox[001]”)yellow(/a) and (a href=”https://www.funnybunny.se/wp-content/uploads/2009/08/redsponge.jpg” title=”Red sponge”)red(/a)

Look at the code of the last link and compare!

The editor often do things like this…

What can I do to avoid this problem?

I also have TinyMCE advanced and Deactivate visual editor plugins, both latest versions. On the post in particular I have deactivated the visual editor, only using the HTML part, but it is still generating messed up code.

Thanks for reading and if I have forgotten something just let me know.