[Plugin: RomeLuv Google Maps for WordPress] Zoom Level not working

I changed the hard-coded zoom level from 17 to 10, but the zoom has not changed on the map.

It remains at closest zoom, and seems not to recognise the value set for zoom in the php code.

Example

http://ww.wp.xz.cn/extend/plugins/romeluv-google-maps-for-wordpress/