We use Confluence Version 7.13.2 and Draw.IO version 9.8.0.
On an existing diagram, previously a line with the style "simple" in either direction 
would allow you to move the connection point and the lines would still stay "orthogonal", ie They would stay horiztonal / vertical. Now they stay orthogonal some of the time and then if you drag the line further, then the connection point sticks and the line goes on a diagonal. When another "tab" - in the same Draw.IO" "file' is added and lines are drawn between 2 boxes, these do NOT show the same behaviour. Any ideas????