I have two shipments with EMS CN. When I hit the refresh button to refresh the whole list, two EMS captchas appear. I can enter the codes and tap OK one at a time. All seems good, except that if I then tap on the first shipment to view its details, this error pops up:
Validation failure, please re-enter verification code.
If I tap the refresh button for just that shipment, the verification succeeds.
As near as I can tell, when there are more than one EMS CN verifications in progress simultaneously, they somehow interfere with each other, resulting in one (or all but one?) failing.