Welcome to the Forum AMBBJ_2019!

This looks unusual. Can you attach your actual Excel file please, with Freeze Panes turned on?

The paper clip icon does not work for attachments. To attach a file, under the text box where you type your reply click the Go Advanced button. On the next screen scroll down and click on Manage Attachments, which will show a pop-up window to Select and Upload a file. Then close the window.