Hello,
It's been a while since I've had a play with php.
Looking at the code you posted, you might want to try escaping those double quote characters that wrap the textarea size parameters.
while($row = mysql_fetch_array($result_reviews))
{
echo "<td>" .$row['username']. "</td>";
echo "<td>" .$row['title']. "</td>";
echo "<td><textarea rows=\"8\" cols=\"50\">" .$row['review']. "</textarea></td>";
echo ("<td><a href=\"editreview.php?id=$row[id]\">
<button>Edit Review</button></a></td>");
echo ("<td><a href=\"delete.php?id=$row[id]\">
<button>Deleat Review</button></a></td>");
}