Trouble to post a picture and add blackslash to url.

I guys !

By the morning I post a new story, and include a img tag, all is ok. I see the image in the node. A few minutes after I post another story with html tag and image content, but I cant see the image. I check my html code and show:

<a href=\"http://i71.photobucket.com/albums/i132/mixtecadigital/maiz0.png\" rel=\"lightbox[maiz]\"><img src=\"http://i71.photobucket.com/albums/i132/mixtecadigital/maiz0.png\"></a>

The system o whatever add "\", fix the code and send again and now I have:

<a href=\\\"http://i71.photobucket.com/albums/i132/mixtecadigital/maiz0.png\" rel=\"lightbox[maiz]\\\"><img src=\"http://i71.photobucket.com/albums/i132/mixtecadigital/maiz0.png\"></a>

\\\ Three backslash.

Again fixed, publishing and again add only one \

Also add blackslash at URL:

<a href=\\\"http://pueblanoticias.com.mx/noticia/arranca-la-feria-del-seminario-diocesano-de-huajuapan-de-leon-19910\\\">

I disable Lightbox2 module and module API, and nothing. The module API is because when I post the last story I used. Delete the nodes and nothing, the trouble is. Also I try using Full HTML or filtered HTML, and nothing. Also unpublish, after delete the latest post and can't fix it.

It is the same when I add a new block with img/url html tags

My host is bluehost, a few day ago update to CentOS 6, it say.

Any idea ?
Thanks in advance for your help.