Firebase why automatic delete data

I created a app and it send data realtime firebase.

But if I wait little time or close page, next time it delete my data.

Why it delete automatic my datas?

Please provide a more detailed explanation of what you are trying to achieve,
what you have done so far, what works, what doesn’t work…

Please show your relevant blocks,
if relevant, your data or lists,
screenshots of the Designer screen or app in action,
so we can see what you are trying to do…

Right Click in Blocks Editor and select “Download Blocks as Image”
for the best image of your blocks.