Strange

Hello,
Yesterday I was adding some hashes when suddenly:
Hash e089a2c290266a4369b5466f32da725c is already in the database, password '' - skipping.
Hash 25b324dba1d57add3582a68b4422a6d0 is already in the database
Hash fb75a887291b8d279c36ddae5c7dd3f5 is already in the database, password '' - skipping.
Hash c660fb545dcea4f1a0baaf7c3dbc911c is already in the database, password '' - skipping.
Hash cda6e00ff2092f81afe3e3b63f9c86e7 is already in the database, password '' - skipping.
What does mean at all?
Yesterday I was adding some hashes when suddenly:
Hash e089a2c290266a4369b5466f32da725c is already in the database, password '' - skipping.
Hash 25b324dba1d57add3582a68b4422a6d0 is already in the database
Hash fb75a887291b8d279c36ddae5c7dd3f5 is already in the database, password '' - skipping.
Hash c660fb545dcea4f1a0baaf7c3dbc911c is already in the database, password '' - skipping.
Hash cda6e00ff2092f81afe3e3b63f9c86e7 is already in the database, password '' - skipping.
What does mean at all?