Sub-Menu Wont Show Up

I was wondering if someone could help me find out why and correct the problem as to why my sub-menu will no longer show up. If you go to my website in the main menu, i have several menu categories i.e. how money works, finance 411, contact that all have sub-categories that were created underneath them. They use to work however over the course of the past two days they no longer will show. They are suppose to be in the drop down and the menu still indicates that they are there as it has the little arrow icon as if you can drop down but it will not. Any help in fixing this matter would be greatly appreciated. The website address is https://www.tomorrowisadayaway.com