Is it normal behaviour having tags being sent twice durin page load?
The first time they are sent is after the tags loads, on this instruction utag.o[loader].loader.LOAD(id).
Second sent happens when it's called the utag.loader.END() function.
This is not a normal behaviour. I would check with support for more details with the URL of the issue and profile. The first trace is the usual trace showing a page load normal call. The second trace seems to indicate that there is an extension "end of tags" triggering a manual call. I would review the configuration with the help of support.