PI BLOCK IN SIMULINK

I have a model in simulink with a PI controller and a transfer function which is shown below.

The PI controller is 3.15(1+2.6s/2.6s) which I have put in ideal form where the proportional(P) is 3.15 and the integral(I) is 2.6 however Im not getting the correct trace on the scope

However when I replace the PI controller with this input output block I have shown below I get the correct answer. Can someone explain what I am doing wrong with the PI block, thanks.

This is what's inside the subsystem input output block.