Two different UA numbers
I have a problem with google analytics because it doesn't register the visits. I've been using the "tag assistant" and it shows completely different UA number than the one in the code I've put. Please explain it to me, how does one UA number get replaced with another one? When I look at the page source, there is inside it within the google analytics a completely different code from the one in my .php. Website is new and this is the first time I put a UA number.