Inconsistent behaviour of scroll saver

How is it possible that scroll saver in a page has different a behaviour in different computer in different Firefox quantum 63.0?

I need to check the reason why scroll saver doesn’t work.

After autopost back the application come back to TOP. The application should save the current scroll.

Does anyone have anyidea why does that happen??
Thanks in advance.
ps:for everythink unclear ask me please.

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