Ok - yes - those are clock resyncs. It indicates the move took a long time to reach Chess.com. This is a symptom of an intermittent connection.
It can also happen with the Chess.com app on a mobile device.
When we push firmware update 1.4.1 - it includes a WiFi meter (how many bars of the WiFi log = how strong the connection).
If you get a chance, please use that and share how strong is the signal. Strength is not everything, there are other ways data gets delayed, but it is a start to troubleshooting the disconnects and delays.