Hi there, thank you for your contribution and please keep it up!

but first of all - don't add a 2nd node where there's already a node for your shop available use that node and just add your additional information please.

Just some notes to improve your contributions:
https://wiki.openstreetmap.org/wiki/Key:level
https://wiki.openstreetmap.org/wiki/Key:level:ref
https://wiki.openstreetmap.org/wiki/Key:addr:floor

And on the addr: tags please read:
https://wiki.openstreetmap.org/wiki/Key:addr:*

Success to your further mapping and please do read the articles so your shops can actually be properly navigated to.
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            Published using OSMCha: https://osmcha.org/changesets/138136119
            