Iveth,
There are 2 divs in your template design that surround the Invite module and are set to "overflow:hidden". This will need to be changed to overflow:visible. The following are the lines. We don't make these changes as they can cause other issues with your site (if other modules cause an overflow), but should fix the JFBCInvite module (and the iFrame that Facebook is using):
1)
caracas.travel/templates/yoo_explorer/css/layout.css, line 79, element "#left"
2)
caracas.travel/templates/yoo_explorer/css/modules.css, line 178, element "div.mod-rounded div.box-3"
Please correct this as mentioned in the Common Support Questions, and the module will not be chopped off anymore.
Thanks!