Default Textra notifications

Just noticed a problem with Texts notifications. I cannot dismiss them from the notification centre. Have received 5 messages over the last two days and despite dismissing the notification, as soon as I do, it returns. And it remains until I delete the messages Running 4.4.2. Was fine previously, don't know if it's a 4.4.2 issue or a Textra update that's causing it?

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