Sometimes SSRS can be a bit "off" at times, and there can be any number of reasons. You can try the following:
- Delete the .data file associated with the report.
- Copy/backup the report and try adding the dataset to a fresh base tablix to see if the data actually shows up.
- Check font color and size.
- Check ExecutionLog3 and other logging stuff, etc. For more details, you can check out the discussion in this link for reference: https://stackoverflow.com/questions/11359194/ssrs-report-not-displaying-data.
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Best regards,
Aniya