Hey, we had a lot of cases in the past where DHL reuses tracking numbers and thus when you check it, it might say it is already delivered in another country. Mine for example was used for a previous shipment to Portugal, while I’m in Bulgaria.
What matters most is the timeline so mind for this and the dates as well. For example mine was delivered let’s say on 30th of April in Portugal, and then on the 15th of May it was accepted by DHL. If this is the case then there is nothing to worry about.