Hi La-Qa,
Please make sure before making any changes to the webpages make a backup copy and then try to customize the pages. As Brian mentioned, try to find the below code in incident/request list pages and if you don't find try to insert the same code in both of your primary and secondary server.Before that, open WSP and check whether these pages already contain changes and ready to update when published.So that you can avoid un-necessary fields/alignment issues.
<PDM_MACRO name=lsCol hdr="Close Date" attr=close_date export=yes fmtfunc=fmtDetails sort=no>
Regards,
Mohan