I recently purchased the Chinese type 62 in the advent calendar event but the tank is not to be seen in the garage....
If I run WoT in safe mode, or disable your addon, then I can see it no problem.
Not sure if this is a known bug or not but here you go.
Worth pointing out that I also purchased the Lansen C in the event and I can see that no problem so there appears to be a problem with the type 62.
Cheers :-)