Thanks for letting us know.
We will immediately take a look at the issue.
I've joined your signature campaign and tried to change my signature with the code provided for Sr. Members. I get the following error: "INVALID BBCODE: close of unopened tag in table (1)"
In addition, the avatar image you provide is too big. I had to size it down.
I think there is a problem with their code or you have copied the wrong code. Try copying other code of below your rank if it works. Your signature right now is " INVALID BBCODE: close of unopened tag in table(1) "