Getting crazy with "Left bar width" and editing

I've a site where I've fixed left bar width to 150px.
All pages start with a grid list in which I set left bar width to 150
https://www.thinbasic.biz/temp/Cattura13.JPG

In 2 of the pages I've editing data with popup when user click on a grid line.


In one page no problem: when user click on the grid ... editing comes out without problems and left bar remain 150px
https://www.thinbasic.biz/temp/Cattura14.JPG


In the other page: when user enter the page the first time all is OK ...
https://www.thinbasic.biz/temp/Cattura15.JPG

... but when user clicks on the grid line to open editing ... I see left bar move to default 300px
https://www.thinbasic.biz/temp/Cattura11.JPG

and remain to 300px ...
https://www.thinbasic.biz/temp/Cattura12.JPG

... till the user click on another link.



I looked everywhere to find left bar width settings for editing window but not able to find anything.

Any help?

Thanks a lot
Eros