Hi,
Wrapping happens dynamically depending on image sizes, text length and screen width. There is no catch-all solution to avoid having single words wrap around floating images, except perhaps to not use floating images at all (or disable floating on specific screen sizes).
@media (max-width: 640px) { /* adjust the maximum screen width floating should be forced-disabled on */
body .alignleft, body .alignright {
float: none;
margin-left: auto;
margin-right: auto;
}
}