Browser related? Here's my browser info for reference:
Build identifier: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0
Yes, it did look like a bug to me because I didn't expect clouds to act like that in what I took to be a simulation of the real world.
Browser related? Here's my browser info for reference:
Build identifier: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0