Not only happens with gifts, but I kept experiencing it when trying to claim stuff I send to my dorf and it gets sent back to my main toon, to my grimace...
This happens a lot with people actually claiming items to. It gets sent back.
Although the topic is about different thing rly, it happens to me too, I try to claim gift, but the **** "send back" button is too close to the "clim" one, so dunno if its just me or it happens to more ppl ...
to the OP, send support ticket, they may help you.
if you gifted an item and it was sent back to you, please contact our customer support (https://support.lineage2.com/hc/en-us) and we'll move the item to the correct recipient.