Running Tkinter canvas draw function again starts from latest datapoint instead of creating new line

I have a canvas where i draw lines repeadetly after adding new values to the array. The plot shows sensor data over time. Now when i want to start the drawing again from the beginning, so that the startpoint on the time axis is again 0 (as it is in the array), the canvas draws a line from the first to the last datapoint of the first run to zero from the new run, but i want to start without connecting to the first and last point from the old drawing. I only want the new line to be drawn. How can i achieve this?

Below is a cutout of the code i use and two pictures showing the problem. Feel free to ask if there is information missing.

def plot_graph():
    while condition == True:
        timePlot = np.append(timePlot, ExChange[0])
        dataPlot1 = np.append(dataPlot1, ExChange[1])
        dataPlot2 = np.append(dataPlot2, ExChange[3])
        lines1.set_xdata(timePlot)
        lines1.set_ydata(dataPlot1)
        lines2.set_xdata(timePlot)
        lines2.set_ydata(dataPlot2)
        
        canvas.draw()

if __name__ == '__main__':

    # ------------------ Create frame for Control ------------------#
    frm_frameC = tk.LabelFrame(root, padx=10, pady=10, bg='light grey', bd=3, width=1650, height=800)
    frm_frameC.place(x=0, y=0)

    # ------------------ Create figure for plotting ------------------#
    fig = Figure()
    ax = fig.add_subplot(111)
    ax.set_title('Data monitoring')
    ax.set_xlabel('time in [s]')
    ax.set_ylabel('[l/min]')
    ax.set_xlim(0, 30)
    ax.set_ylim(0, 101)
    ax2 = ax.twinx()
    ax2.set_ylabel('[l]')
    ax2.set_ylim(0, 1001)
    lines1 = ax.plot([], [], color='saddlebrown')[0]
    lines2 = ax.plot([], [], color='peru')[0]
    lines3 = ax2.plot([], [], color='sandybrown')[0]
    lines4 = ax.plot([], [], color='navy')[0]
    lines5 = ax.plot([], [], color='royalblue')[0]
    lines6 = ax2.plot([], [], color='dodgerblue')[0]
    lines7 = ax.plot([], [], color='darkgreen')[0]
    lines8 = ax.plot([], [], color='limegreen')[0]
    lines9 = ax2.plot([], [], color='lightgreen')[0]
    canvas = FigureCanvasTkAgg(fig, master=frm_frameC)
    canvas.get_tk_widget().place(x=5, y=5, width=1000, height=400)
    canvas.draw()

The ExChange array is cleared completely when running the plot_graph and gets filled by an process running with multiprocessing.