We had one other customer report this type of behavior to us recently. We could not pinpoint the exact element which was causing this since the page worked absolutely fine when duplicated – when we copy the source from the home page into another page and then update it.
Can you try to use another browser and create another page which has the same source as this one and see if the problem goes away? If you are able to reproduce it pls let me know and I can try to take a closer look ( I plan to delete one element at a time in this duplicated page until we are able to zero in on the specific element which is causing this).