Desperately need some help: remove this from footer ????? ???

Hi

I have this theme and works well and have a plugin called MutiX-Bar installed. It has a scroll to top addon and appears at the bottom of the page: You can see it here : https://www.stp.stresscommunity.com/

It also brings up this weird link : ????? ???
Linked to https://www.xum.ir. I would love this removed but do not want to lose the plugin functionality. I have tried to deactivate the plugin and changed the settings to not show the scroller, but it persist.

This is from the source code:
????? ???<div id=’scr_wrapper’>
<div class=’scr_container’>

And Firebug:
<script type=”text/javascript”></script>

<div id=”scr_wrapper”></div>

I would like to know where to change this as I have tried the plugin editor and php files – and cannot find anything
PLEASE HELP ??

Thanks a stack…