Misuse of <td> Tags Outside <table> Structure and Missing Closing </div> Tag (the actually  one)

The primary issue with the original HTML code is the misuse of <td> tags outside of the <table> structure. <td> tags are intended to be used exclusively within <table> elements. Using them outside this context is semantically incorrect and can cause rendering issues. Additionally, there was a missing closing </div> tag for a <div> element, which could lead to further rendering problems.