In the Questionnaire module, any text entered by users in a Text Box question is displayed in lowercase when viewing responses on the "View all responses" page. These values can be seen in their original case by viewing responses one at a time ("View by response"), or when downloading responses as a CSV text file.

Attached is a screenshot of two user replies in the "View all responses" mode, with inset screenshot of each user's original reply (in "View by response" mode).