i get overshoots after applying curve fitting to 2d plot to get more point at specific x coordinate points

hi

i am trying to apply linear interpolation to get point at predetermined x coordinate point , but the issue is that at some points i got so strange point as shown in the two attached pictures. first one is the graph before intepolation and the second one is after applying interpolation to get more point .

for i=1:1:length(A)
    MAX=max(A{i});
    MIN=min(A{i});
    xq{i}=round(MIN):0.005:round(MAX);
    vq1{i} = interp1(A{i},B{i},xq{i},'pchip');
    plot(xq{i},vq1{i},'LineWidth',3)
    hold on
end