Hello Haejin,
I like so much the content you are sharing. The guy telling you to run a script was making a joke to hide your cursor from the current page, nothing harmful. refreshing would have solved the issue. and the other guy, took it to the next level!
Do you have the same problem with other sites? have you tried another browser, like Internet Explorer or Firefox? Answer some questions, eliminate some causes and you will find the problem origin
RE: Bitcoin (BTC) Morning Update: Minor Wave 4 Correction in Progress