Bad synchronization between 2 Nas

[kolarvasek]

Hello,
I have the following problem. I have two DS1515 and DS1518 + devices. Data is identical on them. On DS1515 we turned on the Cloud Station Server on DS1518 + I turned on Cloud Station ShareSync. The problem is that I gave Synology, each to the other side of the republic. And even though the data is the same, I'm getting synchronized between them. Versioning is completely disabled. I have bi-directional sync turned on and only sync files. What's strange is that I'm currently synchronizing a folder with about 1,000 files, and on the main page of the ShareSyncCloud Station, it says she has synchronized 2500 files. Where was he taken? Or, how do I set up sync for two devices that are clones and want to stay that way in the future?
Thanks for your advice