On the iPad, tap the Aa icon in the URL bar and choose Request Mobile Website. If that works, pass that info to Kroger. It would mean the problem is something specific to how iOS Safari handles the full website. The iPhone uses the mobile site by default. Since the iPhone now works, it may be that they fixed the issue for the mobile version of the site on iOS, but not for the non-mobile view of the site.
On the iPad, tap the Aa icon in the URL bar and choose Request Mobile Website. If that works, pass that info to Kroger. It would mean the problem is something specific to how iOS Safari handles the full website. The iPhone uses the mobile site by default. Since the iPhone now works, it may be that they fixed the issue for the mobile version of the site on iOS, but not for the non-mobile view of the site.