Actually, this may have started in Chrome 60 for me, but it's definitely happening in version 61. Every note field I edit in a ticket expands its height by one line for every key press. Or at least, for alphanumeric and Backspace keys -- I haven't taken the time to test other key presses. Since the "Send Message" button is at the bottom of the last Note field, you can imagine how annoying this is. After typing a paragraph, I have to scroll waaaaay down to send the message.
I have verified this on 2 different machines running the same version of Chrome 61.0.3163.100. I have not tested all browsers, but can confirm I do not see this behavior on Microsoft Edge 40.15063.0.0.