Wallpapering Problem?

Have been doing a little piece of wall papering and have noticed on one wall that the joints on the paper a lack line down has appeared on the joint. Is there something am doing wrong or what??? (the paper is white so no black should be in it)

Answers:
Take the rest of the roll back to where you got it and get a refund. Sounds like something got onto the whole roll at the ends.

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