What you forgot to take into account was something called overscan.
In a nutshell, a TV set will never show you what you see on a computer screen. Modern TVs have gotten better at this but it’s not uncommon for older TVs to overscan as much as 20% 🙁
For this reason, Vegas gives you the option to have safe areas displayed in your preview window.
It’s the thing that looks like #.
Enable it and look at your graphics & titles again.
Anything that falls outside of the inner dashed lines may not show up on a TV set so make sure any graphics & titles stay inside of the inner lines.
The text creation tool in Vegas has markings in the placement tab. Make sure any titles stay within this box.
The defaults are 10% for Safe Action Area and 20% for Safe Title Area.
BTW, DVD Architect has an option to display these markings as well.
The easy fix (and not one I’d recommend) is to use Track Motion to zoom the entire project out until your titles & graphics fit.
The drawback to doing this is a black border around your entire project.
To do it properly, you’re going to have to go back and redo all your graphics & text to fit properly.