D7500 and Sigma 17-50 2.8 back focus issue?

[mcpieman]

Hi, I recently bought a D7500 after years of using Pentax DSLRs. I was struggling to keep up with my young son with Pentax AF and decided to see if the grass was greener with Nikon AF. I bought the camera body only and so far have only bought the AF-P 70-300 VR and am now on my second copy of the sigma 17-50 2.8. Both the sigmas appear to back focus, and this is in live view, not so much in PDAF through the viewfinder, so its not fixable with AF adjustment. The 70-300 seems sharp in live view, but even at 70mm its a smaller aperture and longer so its not easy to compare. I'm concerned there might be something amiss with the D7500 to back focus in liveview and want to determine this before its too late to send it back to Amazon within 28 days?

Has anyone else had back focus issues in live view and was it for a particular lens, or was it the body?

Thanks Steve