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Google maps desequilibrated when having browsers session cache pop-up

I'm running an EXAMPLE of a google map API with some cities to plot on this page:
But when I go back in 2-5 minutes to this map the marker are not well positioned:

This issue appears when I click on the refresh button on the 6add127376 follneil
https://chrisconduri.weebly.com
https://neymisnoce.weebly.com
https://neymisnoce.weebly.com
https://proxeseccer.weebly.com
https://graphoxhaspe.weebly.com