syncrepl issue not replicating all changes

Hi Guys

debian stable

openldap 2.4.23-7.2

I have multiple consumers with a single provider, when making changes too the provider ie creating a new user, sometimes the change doesnt propagate too all the consumers some have the correct entries and some dont. If I then compare the contextcsn on both the provider and the consumer it is identical on the consumers with the missing entry. The only way I can then resync is by shutting down openldap on the consumer deleting the tree and restarting which then syncs the directory with the missing entry.

How would I go about troubleshooting this issue? Or am I missing something simple? Any help would be appreciated.