odd finder bug

I've found finder has an odd bug every now at then. I usually have several finder windows open on a few desktops.

Every now and then the sideway scrolling stops working right in the window I'm in. It starts to move then some other random finder window in the background start scrolling, even although the focus is on the target window and mouse also on top of it.

I usually end up using the arrow keys to navigate.

 

I doubt they'll do much, just wondered if anyone else has found it or knows if a setting it wrong