Doubt about using seaborn.kdeplot()

Hi!. I am usig seaborn.kdeplot() to obtain two density functions of different data. Here I post my code:

My problem is that when I obtain the graphic, labels are changed. I suppose it is because x0,y0 corresponds to activ_reg_lineal_2hidden, and x1,y1 to activ_reg_lineal_numpy, but I do not understand why. If someone can explain me the reason would be grateful. Thanks in advance!!