Hi Toufiq,
Which module was changed on my end (I'm sure it wasn't).
The template was working on PageBuiler 3, but I did an upgrade to pagebuilder 4 and it was not proper lined out (for that I made an other ticket).
Regarding this issue, unistall en reinstall didn't solved the issue.
I made a new module called Sleutellabels Megamenu Module. Editing looked nice. Everything was lineout properly. Becuase this module is used in the megamenu, I added in there.
After that I edit again the module and result was shocking. Again the edit boxes where not good. Afte decouple the module from the megamenu it worked again.
Due to the fact the you are using fronend editig this means that the module is showed on two places (in the edit field and hidden in the MegaMenu). Due to the fact hte megamenu is hidden by defauklt I guess you read that position instead of the editing one.
So I guess there is it going wrong..