It sounds like there is a questionable script running in the background of your install, either a different plugin that is injecting code or something in the server. Have you had a chance to check into this with your host? You can also try our Testing for Conflicts guide to see which plugin is causing that (if it is a plugin). I can tell you from our end, we do not place anything of that nature in our plugin suite at all.
Please let me know if this helps point you in the right direction!
Hey there! This thread has been pretty quiet for the last three weeks, so we’re going to go ahead and close it to avoid confusion with other topics. If you’re still looking for help with this, please do open a new thread, reference this one and we’d be more than happy to continue the conversation over there.