Dashboard are missing without any change


I use v5.4.3 (commit: 6539180) version of grafana and grafana.db(sqlite) as database.
All of a sudden I see some dashboards missing, there was nothing I have changed.
When I see dashboards table in grafana.db, I haven’t seen any clue of these missing dashboards.

Can you please help me understand what’s happening and resolve this issue?