Highlighting Problem

That's because when you right click, it automatically selects on the left side whatever type of thing you had selected last time you used the popup. Changing that selected item will alter the selected text. You probably have the verse option selected. If you want to operate on the text you selected, just choose the top item (Selection) on the left side of the popup.

This can be particularly useful when highlighting, because it alerts you to the fact that your highlight might be getting applied to the entire verse rather than just the selected words like you expected.