Confidence interval in inter-rater reliability

Hi everyone

So I used SPSS to calculate inter-rater reliability. To my surprise, the value was not in the middle of the range of the confidence interval.
For example, the reliability was 0.667 while the lower bound was 0.604 and the upper bound is 0.720

How can this be?
When I calculate the confidence interval for the same sample using a t test, the mean is exactly in the middle of the interval.