One of the questions most people hit at some stage is ‘why do my pictures look different when I open them in Photoshop than they do in Lightroom’? The answer is usually a mismatch of colour profiles.
You want your Photoshop Colour Settings to match your LR space – or vice versa.
Pictures are worth a thousand words so:
Photoshop’s colour settings
Edit with settings (in LR preferences)
Export settings (in LR Export dialog)
Which space you edit in is up to you (that’s a whole nother discussion!) but try to keep them the same.
If you tick the Photoshop colour settings marked in blue, it’ll warn you if you ever mismatch and ask you what to you.