Passing argument doesn't always work

I've made a view that uses ubercart's order id as the argument to create a pdf. So the path is /order-invoices/%oid
Works great!

However, I'm also using a rule to save the pdf to the server with the same oid using the token [uc_order:uc_order_id]. This works too.. but only sometimes? I keep randomly getting a pdf named: [uc_order:uc_order_id].pdf instead of 49.pdf, for example.

I can't seem to isolate anything about the order itself that makes it unique in any way... and the view path pulls the proper pdf doc.

I'm trying to incresase php memory limit from 92 to 132.. maybe that will help?

Seems like a bug?