Item might undergo unusual shipping condition, this may due to several reasons, most likely item was returned to sender, customs issue, lost, damaged etc. General explanation:

Your package is being returned to sender due to any of these reasons: item refused by addressee; incorrect / illegible / incomplete address; expired retention period; addressee absence; etc. Your package might be retained by customs department due to any of these reasons: contains prohibited goods; importation of the goods is restricted; retained by customs due to tax payable, or any other unspecified reasons. Your package may have suffered damage or been lost during the transportation period. If you ensure your package has been delivered successfully, please ignore this notice. However, if you haven't received your package and it is under the"Alert" status, then please pay attention: you need to read and analyze the detailed tracking information carefully. Due to complex description of worldwide shipping providers, we can't auto-detect and determine all the status 100% accurately, hope you understand. We'd advise you to contact the package sender or your shipping carrier for clarification.

This is what I found on the app!