How can I store multiple data to Firebase with the same tag?

Hallo I am trying to store data from slider and from the button into the same tag.let's say i click bottom 1 and it stores 1 and when i click bottom 2 it replaces 1 to 0.This is not the problem.the problem is when i use slider the data from button 1 and button 2 got lost,.There's only the data from slider stored. "0158 or 1158" This is how i want to store it the first data is from button and the rest is from slider

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