Dear Karina,
as Torben said, something seems to be different. Did you really specify the same settings for variance ((un)equal) and independence (yes/no) in both models? Did you use the same factors when specifying the models? Are both models estimated on the same set of images? Since non-sphericity estimation depends on the data, different input data may yield different non-sphericity estimates.
You may also want to use "Review Design" to look at the effects of model estimation. You will find a "Design" menu in the interactive window, where you can explore the design matrix, files and factors and covariance structure. When looking at the covariance structure, a multi-page image matrix will be displayed. On the first page, you will find the estimated covariance and on the following pages the individual covariance components for which parameters have been estimated.
Best,
Volkmar
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