UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36

Steps to reproduce the problem:
1. Scroll someway down our website
2. Begin mentioning someone in a post comment (Our platform uses mentions (@username) to suggest people to mention)
3. The gwt-SuggestBoxPopup appears in incorrect place. (i.e. not directly underneath the comment box)

What is the expected behavior?
After typing in part of a users name, the gwt-SuggestBoxPopup should popup with it's top position below the comment box

What went wrong?
The GWT-SuggestBoxPopup is created with the incorrect poisiton and it's severity of displacement increases the further down the page the user is.

Did this work before? Yes 60.0.3112.78

Does this work in other browsers? Yes

Chrome version: 61.0.3163.79  Channel: stable
OS Version: Ubuntun 16.04
Flash Version: N/A

The same code upon which this functionality is built on our end has been tested on different operating systems as well as different browsers as well as the previous version of chrome (60.0.3112.78) and it works correctly there, it's just in the current version of Chrome and Chromium that it doesn't work as intended.