We are having this same issue... zeros in the budget vs. actual on iOS, not MacOS, and only in QuickView on iOS.

We have several reports that are issued automatically on the same day each month.  We have been publishing these same reports with the same configuration for well over a year.  This month, we changed them to use the Excel auto-email version, rather than the default .pdf.  All reports work fine in auto-emailed Excel except for the budget vs. actual reports.

Some of our auto-emails have multiple reports included.  Only the budget vs. actual reports have this issue.

Please reference the attached videos, one from an iOS device, version 15.3.1 and another from MacOS, version 11.6.1.  Please do not say this is a problem with anything but QBO Reporting because enough users have reported this issue for several years and the problem continues, across multiple versions of OS's.