A 9 digit number (129745463) has appeared at the top left of my client’s website. It looks like it is in a top bar but as far as I can tell there are no widgets in a top bar (so no top bar). It just appeared recently. Neither I nor my client know how it got there. I inspected the code and this is what I saw
No, nothing new in hooks or elements. I tried the various suggestions in your link with no result. I then spoke to my hosting company. Support found the 9 digit string in the php config (I think ) file and removed it. So problem solved. No idea how it got there.