Differences after sync on three devices

DEVONthink
1

I sync my databases via WebDav - and from time to time I check the number of objects on DTP (Mac) and iOS devices (iPad and iPhone).
For whatever reason the number of objects in DTTG on iPhone and iPad are different. And the info dialog on DTP (Mac) shows a third - different - number.
Any recommendation how to fix this???

2

Are you using replicants?

3

no

4

In DEVONthink To Go, select Help > Contact Us to start a support ticket. Thanks!