Because the IP that was recorded in the database for you was from a Talk Talk block (from January I guess when you first registered, maybe it had been reallocated since). When you started uploading again yesterday after a very long time it updated to Entanet around 23:00 on a periodic check but you then resynched and it went to IDNet....
Thanks for the confirmation, Tony.
There was certainly a large gap in my uploads. Because I am uploading using a Docker VM on a Mac, I don't tend to run it after a machine restart unless I consciously want to track what's happening with my connection.
I was on a Pulse8 TTB connection until a month ago, so the TT reference must have been from prior uploads.
I did start uploading again from the early hours on the 3rd December and had what looks to be an interrupted upload for 3.5 days. I have had some technical issues with Kitematic since Friday, which I only spotted yesterday evening, which will explain a further restart of the upload yesterday.