[Pascal_S]

Originally Posted by Lizard

The easiest, safest way to sort this out is to get in direct communication with our Support Humans.

Thanks, they helped me.

Originally Posted by Lizard

Here may be what happened...
If you stop using your iPhone for a while, the other clients have to cart around extra data until it catches up in the syncing again. Rather than do this indefinitely (and slow down syncing), after about 2 weeks the other clients drop that extra data and the databases become incompatible.

I sync my iPhone and Mac on a daily basis, if not more. The problem has an other cause. I hope it was just a one-time glitch.