ansible-pull fails on subsequent runs

[Rob V]

for some reason ansible-pull fails after the initial run with 

ERROR! Decryption failed  on /opt/ansible-edge/group_vars/all/secret.yml

i have some files vaulted and i pass the vault file each time to ansible, but for some reason it looks like it just ignores it after.

if i blow away the destination directory and run it again, it works fine.

my command:

ansible-pull -v --accept-host-key --vault-password-file=/root/.vault -s 5 -C master -d /opt/ansible-edge -i /opt/ansible-edge/hosts -U g...@github.com:myuser/myrepo.git