Changing Rates Plot Problem

I have written linear regression code with cost function and the gradient descent. The code works well but the plot is wrong. I think that the source of the problem is temp value but I could not reach to the solution. The red plot should be like blue one but different angle.

Main Code :

clear; clc;

data = load('data.txt');

X = data(:,2:5); % Examples
y = data(:,1); % Number of weekly riders

% Feature Scaling
X(:,1) = (X(:,1)./(max(X(:,1))));
X(:,2) = (X(:,2)./(max(X(:,2))));
X(:,3) = (X(:,3)./(max(X(:,3))));
X(:,4) = (X(:,4)./(max(X(:,4))));
y(:,1) = (y(:,1)./(max(y(:,1))));

m = length(y);
theta = zeros(5,1);
iterations = 600; % Iteration for gradient descent
alpha = [0.01, 0.03]; % Learning rate
X = [ones(m,1) X];
J = CostF (X, y, theta); % Cost Function
[theta, J_history] = GradD (X, y, theta, alpha, iterations); % Gradient Descent Calculation

legend('0.01','0.03')
xlabel('Iteration Number')

GradD code

function [theta, J_history] = GradD (X, y, theta, alpha, iterations)

m = length(y); % Number of training examples
J_history = zeros(iterations, 1);
thetaLen = length(theta);
tempVal = theta; % Temporary variable to keep theta values
alpha = [0.01, 0.03];

for k = 1:length(alpha)
    for iter = 1:iterations
        temp = (X*theta - y);
        for i = 1:thetaLen
            tempVal(i,1) = sum(temp.*X(:,i));
        end
    end
    theta = theta - (alpha(k)/m)*tempVal;
    J_history(iter,1) = CostF(X,y,theta);    
end
plot(J_history,'LineWidth', 2); grid on
hold on
end

CostF code

function J = CostF (X, y, theta)
m = length(y);
% Cost
J = (1/(2*m))*sum((X*theta - y).^2);
end

[madhan ravi]

you forgot to upload yur text file

[Berkcan Oz]

Sorry for my mistake. I am adding the data file.

192000 15 1800000 5800 50

190400 15 1790000 6200 50

191200 15 1780000 6400 60

177600 25 1778000 6500 60

176800 25 1750000 6550 60

152800 63 1610000 16200 200

180800 25 1725000 8200 75

175200 30 1725000 8600 75

174400 30 1720000 8800 75

173920 30 1705000 9200 80

172800 30 1710000 9630 80

163200 40 1700000 10570 80

161600 40 1695000 11330 85

151680 77 1600000 16000 190

160800 40 1690000 11800 105

159200 40 1630000 11830 105

148800 65 1640000 12650 105

115696 102 1635000 13000 110

147200 75 1630000 13224 125

150400 75 1620000 13766 130

152000 75 1615000 14010 150

136000 80 1605000 14468 155

126240 86 1590000 15000 165

Answer 1

[Berkcan Oz]

Can anybody help me please about that ?