Transhipped from China through Holland? Transhipped?
That's seems suspicious.
A load of grain can be re-sold while enroute and go to a second buyer. With the ethanol crazed higher grain prices in the US the grain just seeks the best price. Then again maybe an inspector in Holland rejected the load as unfit for human consumption.
Ships that can't find business have been used as grain for storage while awaiting a good price. Petroleum tankers were used for that purpose when there was a glut of tankers on the market. Also at the end of the vessels useful life as a tanker they would downgrade them to carry grain.