Exported table as PDF has no borders

Steps to follow to reproduce:

• create a new page and go to edit mode
• click "Table" -> "Insert Table"
• add 5 Rows and 5 Columns
• click "Insert"
• type "test" in the table header
• type "test" in some of the table cells
• click "Save & View"
• go to "Export"
• click "Export as PDF"

Result: A PDF document will appear and you will notice the table you have just created has no borders (see attached image).