Replication page - sent/received counts

On the Replicator page, on Notes 5, 6, 7 and 8 there are detail rows with sent/received counts for each database replicated.

Sometimes the rightmost column that displays a text line describing the sent/received counts turns red - seems like it’s when there is a high number of changes replicated.

The count begins to accumulate, and will not reset to 0 or show the normal font until the client is restarted or the manual “Start” replication button is clicked.

Does anybody know why it acts this way - what is the trigger condition?