https://www.rugbyleagueproject.org/seasons/nswrl-1990/round-15/canterbury-vs-brisbane/summary.html
Your records have Matthew Fuller as a replacement for Canterbury. This is what is recorded in the David Middleton Yearbook, however I believe this to be a mistake. It says that he replaced Andrew Farrar who went to the head bin. Interesting he has that listed as well for the following game, Canterbury V South Sydney.
I checked other sources - RLW, Big League, the Daily Mirror & the Canterbury RL Database who all do not show this replacement. I think that he accidentally put it in the wrong games details & did not delete the original "error".
This game was also a Friday night game which I would have watched at the time. I did not note this as a replacement in my own records.