Bucket Storage Namespacing

Hi guys,
I am a bit dumbfounded by some behaviour I am getting when uploading files.
I am aware storage follows the S3 protocol and yet I cannot understand the following problem:

I tried uploading a file using different filenames:

'trxn_31vDS0erUy0PwRefSgvUbu5xvdo/pop/pop_pay_31uXTDw3OPlQnsrbvJJKOubrCwF.pdf' => This does not work (76 chars)
'trxn_31vDS0erUy0PwRefSgvUbu5xvdo/plolp/pop_pay_31uXTDw3OPlQnsrbvJJKOubrCwF.pdf' => This works (78 chars)
'trxn_31vDS0erUy0PwRefSgvUbu5xvdo/pod/pod_pay_31uXTDw3OPlQnsrbvJJKOubrCwF.pdf' => This works
'trxn_31vDS0erUy0PwRefSgvUbu5xvdo/abc/pod_pay_31uXTDw3OPlQnsrbvJJKOubrCwF.pdf' => This works

By not works I mean I get a 404, saying resource not found

Why would /pop/ not work?
Am I misunderstanding namespacing here?
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