GUI Code XLabel Update

Hello, I am trying to create a gui. It will read analogvalue from arduino and plot it synchronous with current time value. However, Xlabels are shifting faster than graph. For example if the value at time 12:31:15 is 4.87, that value should shift to the left in alignmet with time label 12:31:15. Here is my code for plot button. You can see graph in the video that i attached. What is wrong? Thanks.

function pushbutton1_Callback(hObject, eventdata, handles)

global a k stopFlag;

arduinoPin = 'D7';

maxPoints = 100;

% Initialize the counter and stop flag

k = 1;

stopFlag = false;

while true

% Check if the stop button is pressed

if stopFlag

break; % Exit the loop if stopFlag is true

end

b = readVoltage(a, 'A0');

if b < 4

writeDigitalPin(a, arduinoPin, 1);

end

if b > 4

writeDigitalPin(a, arduinoPin, 0);

end

x = get(handles.axes1, 'UserData');

x = [x, b];

if length(x) > maxPoints

x = x(end - maxPoints + 1:end);

end

% Update x-axis with current time

timeString = datestr(now, 'HH:MM:SS');

xLabels = cellstr(get(handles.axes1, 'XTickLabel'));

xLabels = [xLabels(2:end); timeString];

axes(handles.axes1);

plot(x);

xlabel("Current time information");

ylabel("Sensor Voltage");

title("Time vs Sensor Voltage Graph", 'FontSize', 25, 'FontWeight', 'bold', 'Color', 'r');

axis([0 length(x) 0 7]);

set(gca, 'XTickLabel', xLabels);

set(handles.axes1, 'UserData', x);

k = k + 1;

drawnow; % Update the figure without clearing

pause(0.1);

end