First of all, make sure, that you have correct settings in Your Facebook app setup. To check it, go to: https://developers.facebook.com/apps
- on the left side choose You app
- than on the top right click on “Edit App” button
- On the left should be choosen: Settings -> Basic
- Go down into the section called: “Select how your app integrates with Facebook”
- Find setup for Page Tab and check if you have set correct width of used app layout (mine was 520px)
- Save changes, if anything changed
- Than on the left choose Settings -> Advanced
- In the section “Canvas Settings” should be following setup for canvas height: fluid