Export Button Disappears After Customizing Report

Export Button Disappears After Customizing Report

I've been using the reporting module of Zoho Desk to track the number of open and closed tickets our support team gets each week. When I go to add a column for criteria that isn't there by default, I lose the 'Export' button that would allow me to save as an Excel Spreadsheet or CSV file. I copy/paste the information over to a spreadsheet, but it would be good if I could just export the customized report. Is this a known bug?