Matlab Fuzzy Membership Function Problem

Hello,

I have a problem about matlab fuzzy tool. I have data and i want to use matlab fuzzy tool to get membership functions. I determined the membership values and the parameters. I have 5 parameters and only one of them is triangular.. Others are trapezodial functions. When I write the determined parameter values to Matlab, I got the plot but as you can see, there is fluctuation in the line. I dont understand why I get this. Is this a Matlab's bug or sth?

I will add the plots at the attachments.

Thank you for your help..