I've activated a font in the web, it appears in InDesign, but looks a "little bit" weird. Checked the font on the creator's page, I think there is OK, for me it is strange. Is it a normal thing? Is it only a preview to buy directly form the creator or something wrong with my setup? All apps are updated. The font is DomLovesMary Pro, but for example Nori Regular also the same quirky thing.
Do you have View | Display Performance set to High Quality? If it's set to Fast or Typical, rendering and resolution get rougher (as a tradeoff for speed), and whole most of a page might look okay, a very complex font such as this might show more "roughness" than simpler ones.
— | Word & InDesign to Kindle & EPUB: a Pro Guide (Amazon)