Please check your Quick Shop page in the frontend.
If you are using TYPO3 8.7 maybe your frontend is broken. Then you have to move some templates. See illustration below.
If you have to move some templates, you will get a red marked prompt with helpful comments like
You are using a deprecated TypoScript Template. Please move the template “Foundation framework [DEPRECATED AND BUGGY!]” to “Foundation framework” or “Foundation framework (TYPO3 8.7)” depending on your TYPO3 version.