Why is south Carolina red on that map?
Pennsylvania is green so I assume this is a reciprocity map for PA.
South Carolina used to be bad about offering reciprocity until quite recently. I know my carry license from GA did not make me legal until some time in the last year IIRC. Which was a pain, since we end up over there once or twice a year.
So it may be just that that map / the information it is based on is out of date.
GA and SC have just recently reached reciprocity. GA extends reciprocity to any state that reciprocates with us.
SC is red on that map because they don’t recognize a particular state’s CCW permit, in this case PA. You can Google these maps. The “laws” are so inconsistent it is an abomination. People have gone to prison.