MAX31855 | MAX31855 Library for Arduino

I am trying to extract sensor data from Arduino. Arduino code sends sensor data using serial communication every 1 second. My goal is to display this data and plot it in real-time in a GUI using Tkinter. But where I seem to be stuck is retrieving data from Arduino. In my code, I tried to extract the data and save them in multiple variables. But when Arduino is sending only 5 seconds worth of data which is 5 sensor measurements, my python code is saving more than 60 measurements in the variable. I don't have any idea how to solve this. I have been stuck here for some time. Here is my python code.

In the given pictures I ran the code for 5 seconds. That is 5 measurements will be sent from Arduino. I am recieving the data correctly, but when I process them and seperate them in individual variables I have analog_voltage containing:80 , current:70, voltage:75 and temperature:65 measurements as they should only contain 5. What should I do, is there any way to go around this problem?

This is the same issue when I am trying to save the file. For the 5 seconds of data the program saves a million rows of data in csv. Any help is much appreciated. Thank you for reading.

The image for arduino data is just for reference as it is not possible to run both the programs in a same time due to the serial communication protocols hence the data looks different.