I've come across some strange results in Minitab.

The CI at the same % confidence of a difference between two datasets have different values if I use a 2 sample t test or the equivalence test in Minitab 17.

In particular it looks like what for the 2 sample t test is the 90% CI is reported as the 95% CI for the equivalence test.

The results of the 2 sample t test are definitely correct.

Am I missing something?

Thanks