Good comparisons depend on stable names, units and actual set results.
Give variations their own identity
Do not merge different equipment or movements simply because they train a similar area. Use custom exercise names where needed.
Keep numerical entries honest
Record completed repetitions and weights. If your convention changes from one dumbbell to a pair, document the change.
Read summaries as summaries
Volume and strength charts describe entered data. They cannot reconstruct missing sessions or establish muscle growth.
Identify the exercise before entering a number
“Press” is often too broad to support a useful history. Decide whether the entry is a particular machine press, dumbbell variation or barbell movement, and keep that name stable. Record the load convention as well as the unit. A hypothetical 15 kg dumbbell entry can mean one dumbbell; a later 30 kg entry for the pair would create a misleading jump unless the convention change is explicit.
Keep corrections traceable in context
When a result looks unusual, compare it with the set details and note before changing it. A different machine or exercise variation may explain the number. If it was a typing mistake, correct the known value; if you cannot reconstruct it, avoid replacing it with a plausible guess. An exercise tracker is most useful when its records remain recognizable and honest, including the occasional incomplete or uncertain entry.