problem of color

I just install signature and it works exactly like I wanted. But apparently there seems to be a little problem... as soon as I activated it, it adds some crazy font color wrapper around every sign, and even some titles.

Something like this :

<font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"> </font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><div class="links"><ul class="links"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black"><font color="firebrick"><font color="black">