There is now a description of when this is a non-problem. If you have more than one sync interface, every hit in
Total generated updates
on one system will generate a hit in
Old or too-new arriving updates
on the other system. As long as they "balance", there is no problem.
See also sk34118 with the title
Running the cphaprob syncstat command on a cluster member generates unfamiliar output.
/Per Westerlund