Why is a number missing in Review?

Each card reads one kind of data. If you did not log that kind, the card is empty. Here is what feeds what.

A dash or an empty card in Review is not an error. It means the period has no sessions carrying that data.

Good to know

No calories or heart rate

None of the sessions in this period has an Apple Health workout attached. Open a session, tap Edit, then Import from Apple Health.

No match results

No session in the period is a Match or Practice + Match with at least one match entered.

No skills trained

No session in the period has skills tagged under Skills Used. Ratings on the Skills tab do not count here; only tags on sessions do.

Court time looks low

A session's court time is its attached workout's duration, or the duration you set. A session saved with the wrong preset can be edited.