Without any proper system info, screenshots and other critical stuff such as what fonts and formatting options are used nobody can tell you much. This simply sounds like someone went trigger-happy on setting manual kerning using the font palette or similar, which of course will break down as soon as you change the text string.
Without workflow details and screenshots it's really hard to know what is going wrong. You can select the problem layers in your AE comp timeline, press the u key twice to reveal all modified properties and then print screen and paste to the reply field on this forum. If you are on a mac you use Shift + Ctrl/Cmnd + 3 and drag the screenshot from the desktop to the reply field on the forum.
Screenshots + a detailed workflow description will help us help you.
Did you solve your issue with Live Text Templates? We have Motion Graphics templates now, are you using those instead? Anything we can do to assist this case?