Hi Evgene, tried these steps and it still happens for me. I can work-around in FF - I was just trying to give you some information/details you didn't already have.
When I try to inspect element on the central area - it shows me a canvas element - but I did notice there are two separate width/height values:
Maybe some browsers are using the first and others the second? 30 pixels is about the amount of space that is not clickable/hoverable.