System identification toolbox, cannot get the identified model.

Hi there, I have measured a data from an object, converted it and used a identify/system identification toolbox. When I try too get and output signal for indentificated object and it's fit was above 60% I get some weird outputs. When the fit is about 40% the output is the same as this one in "Model output" in identification toolbox.

For example OE331, when fit is good 80%+, but cannot get the same output and OE221 when fit is bad, but output is almost the same.

There is a data in attachment: pomiar_1.txt - data measured identy2.sid - session from ident. pomarynow.m - mplik when I convert all of this data and I try to get them