According to an op-ed [0] in The Guardian there was evidence that Monsanto was behind many false reports that RoundUp was safe:
> Testimony and evidence presented at trial showed that the warning signs seen in scientific research dated back to the early 1980s and have only increased over the decades. But with each new study showing harm, Monsanto worked not to warn users or redesign its products, but to create its own science to show they were safe. The company often pushed its version of science into the public realm through ghostwritten work that was designed to appear independent and thus more credible. Evidence was also presented to jurors showing how closely the company had worked with Environmental Protection Agency officials to promote the safety message and suppress evidence of harm.
> Testimony and evidence presented at trial showed that the warning signs seen in scientific research dated back to the early 1980s and have only increased over the decades. But with each new study showing harm, Monsanto worked not to warn users or redesign its products, but to create its own science to show they were safe. The company often pushed its version of science into the public realm through ghostwritten work that was designed to appear independent and thus more credible. Evidence was also presented to jurors showing how closely the company had worked with Environmental Protection Agency officials to promote the safety message and suppress evidence of harm.
[0] https://www.theguardian.com/business/2018/aug/11/one-mans-su...
Edit: Could not find detailed information on the court case (among plenty of general articles), URL welcome.
Edit 2: jakewins had already provided a link to court proceedings: https://www.baumhedlundlaw.com/toxic-tort-law/monsanto-round...