Bug With Show More

Not sure how to reproduce, or what it is. I hope the video is helpful. This has happened before, with no seeable pattern.

The bug is: occasionally, pressing "Show More" doesn't open any more text, and rarely doesn't respond at all. It has no discernable pattern, and is rather odd.

Computer Specs: OSX Yosemite version 10.10.4 MacBook Air (11-inch, Early 2014) Processor 1.4 GHz Intel Core i5 Google Chrome Version 44.0.2403.130 (64-bit)