Unable to select text with the mouse

Hello,

Since this morning, I'm having a big problem with the computer I bought a few days ago.

In fact, when I hover the mouse over a sentence and select it, that sentence turns gray like this for example: https://cl.ly/1K0A0s0G472k. Then, if I press ctrl+c on my keyboard and then ctrl+v, the sentence is not copied and therefore impossible to paste.

For those who cannot see the difference, when a selection is active it shows up in blue like here: https://cl.ly/1F3f0U3f1x3g, whereas in my case my selection is gray and thus inactive for doing a ctrl+c for example.

It's really annoying because I have a lot of keyboard shortcuts that I prefer to use instead of the mouse.

I've tried several mice (Logitech G602, wired mouse, another wireless mouse, etc.) but it hasn't changed anything, which makes me think that the problem doesn't come from the mice and even less from my keyboard which I also changed.

So, has anyone else experienced this issue, and if so, how can I resolve it please?

Thanks in advance

Configuration: Windows / Opera Next 54.0.2952.64