Hi there!
I honestly never had a problem!
When you set up a canvas, make sure you select RGB and when you open up the file in Photoshop make sure you keep the same colour mode or the colours will be changed. Also what kind of monitor do you have? That might impact how you see the colours
Make sure you don't have night mode on and that the brightness is up, I trick myself sometimes, think that the colours are weird and then I realise that I was in night mode so it was all orangy... so try to check this little things!
Let me know if this is not the case