Social Sign-in

When users sign in with social, a pop up screen loads and once they login, it shows a broken version of my website for about 5s and then closes. For my other site, you did some modifications to reduce this down to like 1s I believe.

Is there a way to either make it close instantly or show something nicer than a broken format of my site?

If the 1s is the only option, can you please ensure that it is applied to both my sites?

Thanks so much and happy new year