I check it on several browsers. No shift here either.

I am not the technical one around here (avatar says it all) hence i only use VSD

Rolly or smoene else might explain, BUT apparently the code VSD creates, is slightly different in some way to the HTML editor.

As a result sometimes a box with text, or and image possibly slide shows etc plays a little havoc !, and a gentle nudge to right , left , up, or down often resolves these issues, hence leave till NEARLY finished, as we all tend to go back further down the process, and tidy things up before publishing anyway.