Remove image title display on normal WordPress page

Hi,

If you go to https://www.millerfoodguide.com/%E8%80%81%E4%B8%89%E5%AE%B6%E6%9B%B2%E9%9D%96%E8%92%B8%E9%A5%B5%E4%B8%9D-%E5%AD%A6%E5%BA%9C%E8%B7%AF%E5%BA%97-lao-san-jia-qu-jing-zheng-er-si-xue-fu-lu-location/

you will see, at the bottom of the page, a map. If you click on that map, it enlarges a bit. The problem is that the title of the map displays under the map. How can I make it not display? I tried just removing the title from the image in the image gallery, but it keeps re-creating itself.

Thank you.