Been away for an hour, blimey that went fast..and a few notes on random comments from someone who has been the other side of this on occasions:
Shannon used lots for training, you'll see lots of ups and downs.
FlightRadar often loses accuracy (position, speed and altitude) at low level because of the way it gets it's data, so aircraft apparently ending up in odd places on landings not unusual.
Re emergencies and these 7700 Squawks again..Most of the time the pilots are actually told/asked by ATC to enter the 7700 into the magic box on the flight deck simply because it makes the aircraft's return on the screens more visible to the controller working the flight and also to other controllers working adjacent airspace, not because anybody thinks a wing/engine is about to fall off.
If you take off and have a relatively minor problems that stops you proceeding as planned (e.g. gear won't come up properly, flaps won't come up properly, pressurisation not working OK) than ATC might want to "park" you somewhere to dump fuel and might want to make sure everybody with radar can see you easily....
In most instances having worked the problem come up with a plan and started dumping fuel the crew's problems are almost over, especially if a normal landing is anticipated and one of their biggest concerns might be what happens to their roster..
I also maybe ought to tactfully point out that given the majority of 7700s are for medical emergencies, which can sometimes be nasty ( I was involved in a handful when I was flying), sometimes v nasty, the pros, both pilots and cabin crew can sometimes get a bit 🤔at what can appear to be an element of ambulance chasing whenever one of the tracker sites pings up a 7700 warning.