Those are two wildly different things. Most things are flawed. Deliberately fabricating results is anathema to advancing science.
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
Really, though, how/why would we expect otherwise? There's nothing in the system to prevent it, and plenty to incentivize it. There's really no good reason to expect (under the current system) that it would not happen (a lot). Without systemic change, it will not get better.