Mouse scroll direction randomly changing

Hello! I use a Logitech M535 wireless (bluetooth) mouse with my Macbook and since I upgraded to macOS10.5 the mouse wheel scroll direction keeps randomly changing, so I have to go into the settings and change it back.

I know, I know, first world problem, but it's reallllyyy annoying. Normally happens when I open a browser (Chrome) then I scroll the wheel down (to move the page down) only to realise that macOS has switched the scroll direction, so I have to scroll the wheel up instead. I then go into the Logitech options (which, by the way, still shows the correct 'standard' scroll setting) and have to switch to 'natural' then back to 'standard' again and voila all is good with the world. I've updated the Logitech software to the latest version but still no luck.

Any ideas???

Thanks all,

Mark