It is normal for a player’s singles and doubles ratings to differ. They are different games with different movement demands, tactical priorities and partner dynamics.
Singles rewards court coverage
Singles places more emphasis on serve depth, return quality, movement, passing shots and the ability to defend open court. Conditioning and point construction play a larger role because one player covers the full court.
Doubles rewards connection
Doubles asks for kitchen positioning, dink patterns, resets, counters and communication. A strong doubles player understands when to protect the middle, when to let a ball go and how to create pressure with a partner.
How to improve both ratings
Log the correct format, train the specific situations it demands and avoid assuming that success in one format transfers automatically. Use your separate results as useful feedback: they can show which game deserves more targeted practice.