How to report missing or incorrect data on portfolio-report.net?

HI,
I noticed a split event is missing for TSLA on portfolio-report.net https://www.portfolio-report.net/securities/dd6ee75d413643ebbf509f5d3c8dbde6

What data source uses portfolio-report.net ? And how/where to report data issues ?

Like this.

Please look at Historische Kurse von Portfolio Report - #365 by FlorianAlexander and following.

It seems that portfolio-report offers only unadjusted quotes.