ok, let's analyze your screenshot from the task #09 of the 1st Post :
Text ► 'Send Shinkansen 500 locomotive' ✔
Image ► 'Shinkansen 500' locomotive' ✔
Counter ► '0/25' ❕
... the complete task is to send the Shinkansen 500 locomotive 25 times to Mizuki [it is impossible to send single locomotives please attach any wagons to the loco (min. 1, max. 11)]...
And I am pretty sure that this will work, should problems persist, please tell the support team your request, thank you.