Aligning pages across 3 monitors

[Hodsocks]

I have a new pc with 3 monitors which I want to use for my trading, if I open a web page and drag it across the 3 screens, the first screen is fine but there is a gap at the top of the other two screens. If I move the page up on the second or third screen it moves up the first screen so there is now a gap at the bottom. They are three identical screens connected via HDMI to my graphics card. I have checked the settings in windows 11 and also in the Nvidia software and they all seem to be fine. I feel as though its something simple but cant get to the bottom of it.
Any help would be appreciated.