Seems like you have placed the catalog list simple plugin in the right column of your page. This produces a JSON output that is required for the suggestions displayed while typing in the search box.
Maybe renaming the plugin would make this more clear.
Questions around the TYPO3 integration and plugins as well as Flow and NeosCMS
Forum rules: Always add your TYPO3/Flow, Aimeos and PHP version as well as your environment (Linux/Mac/Win)