BUG: Tangle falls apart after I click on node in dynamic example

Testing dynamic example, I just opened the code in browser without any chnange. When I click on some node, sometimes just once, sometimes more times, the whole tangle collapses, meaning links between almost all nodes disappear and every node goes it's own way, disconnected. This happens only on click, not on drag.
What could be the reason and how to fix it?