Most likely, subscript is set in your type settings.

Sir, could you please be more specific? How do I change the settings? I would really appreciate your help. It’s driving me nuts. I ain’t a designer so…

See the link above.

Sir, it doesn’t seem like that’s the problem. Or is it…? Still can’t figure out

As you can see, neither strikethrough nor subscript has been applied. Probably the line above the characters is part of the glyphs in this font. Try opening this font in a font viewer. Or try using a different font.