You've posted this in the section intended for reporting possible software bugs. For assistance using FileMaker, it's better to post those question using the FM Pro Forum section. (See tabs at top of this screen.) There, a question such as this will be seen by many more people and thus will gather more and faster responses.
Simply clicking on a text box will not modify data unless is is designed to do so via a script trigger or by setting up the field as a button so that the mouse click performs a script or script step. You'll need to enter layout mode and investigate the settings on each such field.