Plugin results in a coding error (double quotation marks & backslashes)

The plugin causes, that my own h3, h5 …. tags are result in a wrong output.

My code in a simple page:

<h5 class="h5headline"><span class="h5background">This is a h5 tag with background stripes.</span></h5>

results, that these CSS are not interpreted right:

.h3headline {
background: url("../images/shared/stripes.gif") repeat-x scroll center 10px !important;
font-weight: normal !important;
letter-spacing: 2px !important;
margin-bottom: 12px;
margin-top: 20px;
padding: 2px !important;
text-align: center;
width: 100%;
}
.h3background {
background-color: #FFFFFF;
color: #BCA7B8;
font-size: 15px !important;
letter-spacing: 2px !important;
padding: 2px 10px;
text-align: center;
text-transform: uppercase;
font-weight: normal;
}

Result with a backslash error:

Screenshot Firebug:
https://oi41.tinypic.com/bgqo7p.jpg

It should look like this:
https://oi43.tinypic.com/dcyf40.jpg

But it ignores the centering and the stripes background because there is a “quotation marks” too much as well as an unnecessary backslash:

Firebug Screenshot:
https://oi42.tinypic.com/4vimg2.jpg

I have now isolated this error for hours, deactivating one plugin after the other, talking to my premium theme author and by deactivating plugin after plugin and activating one after the other, I discovered, that this error appears, when only your plugin is active.

So could you please fix this?
Thanks!

https://www.ads-software.com/plugins/seo-automatic-links/