question about using Adaptive Filter resuse

[weitong]

I have a question about using adaptive filter (maybe it is a silly question).

I am using the adaptive filter to deal with the experimental data. Through a lot of loops, the coefficients get convergence, see the bottom enabled diagram.

Then using these coefficients set to a new filter created by "AFT Create FIR LMS VI", and again filtering the same experimental data  by the "AFT Filter Signal VI". See the top disabled diagram. 

The questions is: after many loops training, the final filtered result is good, however by using the final “trained” coefficients set a new filter it doesn't work well. So am I wrong using the adaptive filter? How to reuse the well-trained adaptive filter?

Thanks.

LV2019