Yes I work with these IPD spreadsheets every day and they all have typos often in the time/date column (issues with midnight and new years are very common) this can result in an erroneous reporting of something like average drug exposure or clearance if 1 or 2 subjects have uncaught errors in the reported data

I would expect 26% or more studies have these flaws but faked data is a different thing entirely and 26% fake would be incredibly worrying