TD's and TR's are HTML components of tables, which enable you to place content in specific places on a web page and within your table.
Please ensure that you places your TD's (table divides) and TR's (table rows) are in the correct table. 

Here is a helpful link to help you understand more about TD's and TR's: http://www.w3schools.com/html/html_tables.asp

If the new TD's and TR's are not located in the same table as you other information, it will cause you page to format incorrectly.