Nifty fifty focus issue

I did some engagement photos over the weekend and there were a few that I shot with my nifty fifty. I had the focal point display turned on, and despite the fact that the focal point was the eyes/face, that area was blurry. But, below that (around the chest area) everything was sharp and in focus. I can upload a few examples later today, but was just wondering if anyone experienced this before? Or maybe I'm just missing something completely obvious...

Assuming you were choosing focus points other than the centre--well, I seldom trust those, particularly in certain lighting circumstances in which non-subject areas are higher contrast than the zone you want to grab focus on. If the light was challenging in this way, this could be the culprit.

I shoot weddings with a 50 1.8 and totally trust it to grab focus. Although it occasionally misses focus (for the above reason but also out of user error), it has been pretty reliable.

tbsguy18 wrote in post #17237777
I did some engagement photos over the weekend and there were a few that I shot with my nifty fifty. I had the focal point display turned on, and despite the fact that the focal point was the eyes/face, that area was blurry. But, below that (around the chest area) everything was sharp and in focus. I can upload a few examples later today, but was just wondering if anyone experienced this before? Or maybe I'm just missing something completely obvious...

could be shutter speed, 'DOF" - post a pic
the 50mm 1.8 is sharp at the focus point for me