[Infopro]

Try this, go to your Styles Manager click Style Vars on the drop down for that theme, and write down your Sizes & Dimensions settings. Now click the revert boxes beside those you've changed and save.

Now try changing them again as needed. You might find you've got one set wrong.

If you want to poke around your templates, try the SHOWTHREAD template. If you open that template and search it for the word tag, you'll find the area that's in your 2nd image.
(You'll also find the variables that are called from the Style Vars mentioned above)

If that template is edited, you might want to revert it to see if that solves the prob.

HTH