You want the formatting of your slide text to show as 2nd instead of 2nd. But much to your frustration, PowerPoint makes superscript formatting for numbers happen whether you want it or not.
PowerPoint automatically applies superscript formatting to the ends of ordinal numbers, which are numbers that show the relative position of something in a sequence, such as 21st, 22nd, 23rd, 24th, and so on.
You can stop the automatic formatting by closing your presentation and canceling superscript mode. Here’s how:
If you are using PowerPoint 2016, 2013, or 2010, click File> Options.
If you are using PowerPoint 2007, click the Microsoft Office Button , and then click PowerPoint Options.
Click Proofing, and under AutoCorrect options, click AutoCorrect Options.
Click the AutoFormat As You Type tab, and uncheck the Ordinals (1st) with superscript check box to prevent PowerPoint from applying superscript formatting to numbers.
Tip: For more about how to use superscript and subscript in PowerPoint, including how to turn them on and off when you’re working with text, see Format text as superscript or subscript.