EOS R6 - Group Pictures Not Sharp

[avpotterphoto]

Hello everyone! I am a wedding/lifestyle photographer and I’m having an issue with my pictures lately. I bought my Canon R6 about a year ago as well as my 24-70 mm 2.8 canon lens. Recently, I’ve noticed that when I take group pictures, four or more people, the images are not sharp at all, which I’m very confused by because my aperture is either 4.0 or above to make sure everyone is in focus but this hasn’t been the case. I will link some pictures with the issues below. Is it an issue with my lens maybe? I would really like to get this figured out. Thanks in advance!

https://avpotterphoto.pixieset.com/share/675a85219d2f9

https://avpotterphoto.pixieset.com/share/675a85c48ecbe

[ctitanic]

I checked your second picture and what I noticed is motion blur. The child on top of the man is the one that does not look sharp enough but at the same time my guess is that he was the one moving more than the rest because of his position (to me he was moving in two directions - toward you and parallel to you balancing over the shoulders). You were shooting at 1/250, for that picture you need something around 1/500 because they are moving toward you and that is harder for the AF.

The first one looks good to me. Keep in mind that in a large group the people on the end of the line are at a longer distance from you than the ones in the center if you align then in a straight line. That means that the ones on the end may look a little bit softer than the one in the center. In this specific case you may have gotten a better result if the group was aligned in an arc. 

But again, the result in the first picture is more than acceptable.

[Ron888]

I think your lens is front focusing.
Notice the tiled ground surface in both photos is at it's sharpest *in front* of the subjects.
In the large group image the center subjects are near the back of the acceptable focus zone,so don't look too bad,while the outer subjects fall slightly behind it.
In the second image it looks like everyone is behind the acceptable focus zone.
Set up a focus test or have an expert do it