the problem is in cards themselves.
you probably have copied the text from somewhere?
you should note that anki copies the html properties and styling by default. if you with to remove the styling from the text, you should hold shift while pasting the text.
here’s one of your cards after i edited it in HTML editor (ctrl+shift+X) and removed HTML properties.
and here’s what caused the problem:
it’s visible only in HTML editor.
to solve this problem you’ll have to re-write all cards and remove formatting when pasting the text this time, or you can manually edit every card in HTML editor and remove all HTML properties.