Browser jumps when trying to reorder a Block

Hi all,

I have a relatively new issue which is very frustrating as I’m unable to move blocks where I need.

More specifically, when trying to drag a block to a new region using the handle, the browser jumps straight to the top, the handle loses its grip and the block ends up to a random region. Trying to drag it again in small increments makes no difference. 

I’ve also tried to move it using the field selector.
This works however, I’m then unable to position it exactly where I want within the region.

I’m using Chrome Version 66.0.3359.139 (Official Build) (64-bit).
The issue is also visible on Firefox version 59.0.1 (64-bit).
I’m using Drupal 7, the latest version.

I can confirm this issue is very new.

Can you please help me troubleshoot this and identify whether it’s a bug.


Drupal version: