The engraving is not complete on the tag.

When the engraving is not complete on the tag, like shown in the following photos:

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It means that the tag is not well packed in its packaging, like shown in the following photos:

The tag needs to be packed correctly: to do this operation, please watch this video tutorial https://we.tl/t-1Nx1Btozjl

Another possible option is to increase a little bit (for example of +0,2/0,30) the engraving depth on the machine.
To do this operation, you can follow the instructions reported in the enclosed PDF