[owncloud] Contacts sync only works one way

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I added my carddav account from owncloud (6.0.3) to davdroid 0.15.14.
Contacts from my phone do not get uploaded to the owncloud account.
I tried to manually click the “Sync” button in the account but except updating the “last synced” time nothing seems to happen.
I tried adding a test contact manually to owncloud through the web interface and that successfully synced to the device.
Calendar syncs ok.

Device: Sony Xperia M
ROM: CyanogenMod 11
logcat:
http://dropcanvas.com/crso0/1

[rfc2822]

Thanks for your report.

According to the logs, the Contacts provider didn’t report any changed contacts to DAVdroid.

Please provide detailled steps to reproduce. I can’t have a look at the problem when I don’t know how to reproduce the problem.

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I’m not trying to sync from the provider to DAVdroid, but from DAVdroid to the provider.
Syncing from the provider to DAVdroid works fine.

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Suddenly it worked.