Has anyone experienced having a report font change, page-to-page?

In other words, a report is printing at the expected font and pitch, then
just after a form-feed, the font or pitch or both will change for the
remainder of the report.

This also happens to some of our customers, report-to-report.

They will select to print a report; the first report prints as expected.
Then the same report is selected, this time maybe for a different date
range, and the report will print very condensed.

Any ideas / suggestions?

Thank you,
Doug