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Discrete Transfer Function Direct VI not working correctly


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I'm trying to simply do an integration with this VI. So I discretised a continuous integrator in MATLAB using the 'tustin' method, and feed its numerator and denominator into the discrete FXP transfer function. Then I deployed FXP transfer function to the Direct Transfer Function Direct that is compiled in the FPGA. I then tested it by feeding a sinusoidal input and and I am expecting a cosine. Indeed there is a cosine, but the amplitude varies as shown in the picture (https://1drv.ms/u/s!ApGS4APr_VQLhsR3EUfv68vaC9LMfw?e=x1ZemW); the red one is the input and white is output. Does anyone know why? 

Edited by aldosebastian
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