Thats the exact same thing happening to me, after reaching the US, my package is now headed to Milan according to tracking, back to Marco, due to ‘incomplete address’, when i’ve received a bunch of packages from Marco no problem! So frustrating, and Marco explained the process to me, and its an incredible amount of work for him to do when packages go back to him....i hate that he has to deal with this stress and nonsenseI would. USPS recently returned an order of mine to Italy even though my other orders have made it fine to the same address. It is also reassuring to have much better tracking and faster shipping from UPS. It's worth the 30 extra euros to me.
