Last Post Time Problem

Taking Big Fluffy Matthew’s advice, I’m re-posting this.

Seem to have a minor problem. My GST+ time is incorrect. Keep getting this at the bottom of the forums page:
“All times are GMT + 6 Hours”

I tried to fix it in my profiles but it won’t change. Hit the submit button so it would appear I’m saving the changes but it reverts back to GMT +6 every time. Am I missing a step to make effective changes in my profile?