Hello to all

I am working on some of my pages using tables, and when I am working on them they look great but as soon as I click on previes, the stuff that was right next to each other in adjacent tables are now like inches apart

It is quite annoying. I do not understand it. It looks great when I am typing in text or adding images, but like I said as soon as I click preview it spaces everying out very badly

Any idea would be nice