Love it but with one problem – Hannah's Cheerleader Girls Review

I love the game but I can only use the items that don’t need advertisements, cause it will always say that the ad is not available even if I have WiFi. Other comments talk about the issue so I cannot be the only one. My little sister’s IPad can watch advertisements even if she is right next to me, so what is the problem with this app on IPhones? Edit: My IOS version is 11.4.1, thank you for replying.
Review by CawaiiKat1221 on Hannah's Cheerleader Girls.