PostScript fonts are an older system fonts and installed fonts font is recognized by the. System fonts are pre-installed on fonts and stick to them select the downloaded font.
Look for True Type or OpenType fonts. You've not only added the font to Photoshop, but added it to every program on your Mac that has fonts. Make sure Photoshop is not running when you are adding the fonts. Save them to a new folder on your desktop, such as "Temporary Fonts," for safekeeping. It's possible to create one on a Mac, but there are apps in the App Store that will allow you to download fonts to the iPad and package it into a configuration profile that you can install.
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