Above is an example of what happens. It seems that the first integral is longer than the second because the y-character is longer than the x-character as this doesn't happen with other similar-height characters:
Is there a way to change this so that the integral defaults to the larger size regardless of whether x or y is used?
If it's any help: the stylesheet is Outline and the screen environment is bulleted.
Edit - In response to the comments, this was in a text cell (part of a set of math notes)
Edit - By default it is in TraditionalForm. Converting to StandardForm, then back to TraditionalForm makes them look the ideal way: