same code giving different output on two different versions of matlab in the same system

here I attached the screenshots of both the codes which I run on two versions of matlab 2021a and 2014a both codes are run on the same system but the output graphs are different

please tell me why this error occur?

here I am giving the code

eqn1='x*Dy+2*y=4*x^2'
y=dsolve(eqn1,'y(1)=c','x')
hold on;
syms x;
for cval =-5:5
    ezplot(subs(y,'c',cval),[0,5])
end

axis tight
xlabel('x')
ylabel('y')
grid

[Jan]

If you post the code as text, the readers could run it by their own.