Character styles Baseline Offset might do what you see. Notice that in the Style Manager, under Advanced Formatting, there are three boxes. The furthest to the right is Baseline Offset.
When I change that setting upwards, and here I set it to 66, selected text will be moved up from the normal text baseline, much as you see in your example. I don't know if you might have unintentionally set Baseline Offset, or if you have a bug or glitch.