Wrong rendering of google maps

My map looks like this:

I don't know what it is, b开发者_运维技巧ut I think it has connection with style o div, in which it is located:

div#col_left {
    width: 140px;
    float: left;
    height:auto;
    margin-bottom:20px; 
}

I just took a very the simple V3 example and added your style to the map_canvas div, it worked like a charm without clearing the cache or anything. I'd recommend posting to the Google Maps JavaScript API V3 forum with a live (publicly accessible) example so that people can have a look at the whole thing.