Hello RosieGi,
Thanks for reaching out through the Apple Support Communities about that difficulty with that particular shortcut on your Apple Watch.
To clarify, are you launching the shortcut from the Shortcuts app on your Apple Watch, or as a complication from your watch face?
Is the Starbucks app all up-to-date on both your iPhone and Apple Watch? How to manually update apps on your Apple device
If so, does that continue if you delete that shortcut and then set it back up? Delete shortcuts
Hopefully those details will help to further isolate and address this behavior.
Take care.