Unwanted outline of selected subject in Lightroom Classic

It's interesting really, since this was a low light situation and I was trying to enhance the subject, I reset the photo from any edits, and there doesn't seem to be any chromatic aberration until I select the subject and begin to enhance it. So, I'm not saying there is none present, but I believe it's definitely emphasized when Lightroom is asked to separate the subject from the background and amplifies the contrast.

Totally, and in many photos, that's the fix. Strangely, with this image, the box is checked, there doesn't seem to be any until I select the subject, and in lightening the subject, the contrast between that and the dark background is when the outline appears.

thanks for the reply!

Ahh.. I do recall reading about this a bit before, and did just assume it was a masking thing. I'll look into the chromatic aberration aspect a bit more and keep that in mind next time, as it seems to be something much easier to solve naturally in camera, like most things. Thanks for the response!