UserAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Example URL:
https://jsfiddle.net/ogs6sz49/

Steps to reproduce the problem:
Requirements to reproduce this bug:
 - Use Chrome 61 (works with Chrome 60)
 - Enable the multiple selection on the <select> element
 - Place the <select> element in a flex layout with the property 'flex-grow:1;'
 - Add a lot of <option> elements in order to display a vertical scroll bar

Then using this jsfiddle: https://jsfiddle.net/ogs6sz49/
1. Scroll until you can see the option "60"
2. Click on it in order to select it (don't press CTRL or CAPS)

What is the expected behavior?

What went wrong?
- The list is scrolled below without any reason.
- The selection in the list is incorrect, only the option "60" should be selected but after that a range from 60 to 75 is selected.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes Chrome 60

Does this work in other browsers? Yes

Chrome version: 61.0.3163.100  Channel: stable
OS Version: 6.3
Flash Version: