From what I've read above, I'd bet this is actually a simple misunderstanding of how the daylight savings time shift displays. Though you might be located in the Central Time zone, which is GMT-6, during Daylight Savings this will display instead as GMT-5.
This doesn't seem correct I know, but rather than display as GMT-6 with a +1 hour offset, it displays as if you have shifted one hour east instead. This gives the same result, it's just not clear when you're focused on the offset as it normally relates to a location.
Bitman