Outlook - Scrolling Issue

Since the recent Office 2016 updates we have a number of users having an issue with scrolling through emails in Outlook.

Here's what happens;

User opens an email (or replies to an email).

Then the user tries to scroll to the top of the inbox (sorted by date order for example).

After dragging the scroll bar up to the top (via wheel or left click), the scroll bar jumps back down to show the 'active' email in the centre. Basically it keeps the view pane showing the last 'active' email in view.   

There's no way of cancelling the active email. The users have to keep clicking higher up the list, or press 'Home' on the keyboard to get to the top.  

We have re-installed/repaired 2016 install on multiple machines and it's only been happening since the recent updates.  

How do we resolve this? I'm thinking it's a new feature but it's causing a lot of issues.