It doesn't look flipped to me, because the orientation of the other waves (particularly P and T) seem to be proper. However it does look unusual for the Apple Watch ECGs. If you look at a sample 12-lead ECG, most Apple Watch ECGs resemble lead I or II (the standard lead used for rhythm strips, and that makes sense given what acts as the positive and negative "leads" with the Watch). For your son's reading it looks more like V1 or V2 with a very prominent T-wave, which would be unexpected unless the Watch isn't on his wrist, or if his arms and chest aren't anatomically in line with the average. I can think of a number of possible explanations for it but to clarify what it is, he'd need a standard 12-lead ECG. Probably not a life-threatening thing but I'm not his doctor and don't know the details of his life or health. If you have any concerns, I'd have him take it to his primary care provider for their thoughts.