Twenty Eleven menu limits after switching to linux hosting

I just switched from a windows based hosting to linux hosting. After I did this my menu will not allow as many sub menu items. Each time I try to add a sub menu the entire site switches to links at the top of the page instead of a navigation bar. I then change the customized menu section of the theme to select “home” to change back to normal but it will not hold any of the newly added sub menu items. Also, when I view my menu screen it turns the new submenus into links instead of pages. I’ve tried turning off plugins & resetting the permalinks. I only had this problem after switching to linux. Is there something special I need to do to adjust my menu settings?
Site:
https://carter-waters.com

If you look at the site, the home page shows “button” for each division. The drop down navigation menu should have all of the same items under catalog but it won’t add them. PLEASE HELP!