Dating sites are often grouped with porn so far as adult filtering is considered,you probably have safe browsing enabled, either in Google itself,in your browser or possibly even in your router settings
Some internet contracts come with adult filtering options enabled, you might need to login to your suppliers website and turn them off? Or as above, there might be a setting on the router, go into settings and have a look around.
VPN might well do it - the app will likely use your IP to help locate itself and some can only be used in certain countries, so if you're pretending to be from elsewhere then it might well not load correctly.