Problem in UI


I have a table which has some data. on clicking the row im showing the details in a form below the table. The issue is sometimes on selecting the table data doen’t show the form. But when i add ?debug parameter in the url. The form is diaplyed properly irrespective of the times the data (row) selected in the table. What could be the issue?. If the ?debug parameter is not appended, the form is shown one or two times , after that no response.