Photo distortion issue I could use some help with

My wife took this photo recently and I noticed some distortion in it while I was going through the batch in Lightroom. Here is the original:

Photo distortion issue - the original photo

And here is the detail:

Photo distortion issue

I’ve noticed this distortion in photos I take with my DSLR and I don’t know what causes it. This particular photo was shot at 1/3200 sec, f2, ISO 100 and with a 50mm lens. This particular view is visible like this when I zoom in with Lightroom (the single click zoom when developing or viewing photos).

The person my wife took the photo of is out of focus but I have seen this sort of distortion in a number of photos. Is the image quality setting in my camera? The photos are shot in JPG.

Any ideas or tips?

Paul
Enthusiast, marketing strategist, writer, and photographer. Passionate about my wife, Gina and #proudDad. Allergic to stupid

What do you think?

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