I am using chrome canary(V.26 on Windows 7) and I see this effect as well. I used chrome inspector to see if it was in the css code and it seem that this code
in element
<div class="event-details">
body.event .event-header .event-details {
float: left;
}
is causing this effect, correct me if I'm wrong :)
EDIT
If this is your site you can prevent it by adding this to the code min-width: 540px;
or just removing float:left
This question on SO might be similar to your problem.