F5 GTM Manual Sync not working

Hi,

 

We have 2 GTMs, one in each DC.

 

Both are configured as Active-Active with Sync Only groups.

 

Now I have configured Sync as Manual incremental, but still it works like Auto Sync.

 

I never get prompted for syncing manually. Whatever changes are done, are immediately synced to the other.

 

I have re-configured the Sync Groups, more than a couple of times, still no use.

 

Let me know if this any known issue.

 

We are running v13.0.0 VE on Microsoft Hyper V.

 

Regards, Allwin