So this is a reprocessed batch of 30ltrs, to which you added another 50 litres of oil of unknown titration on which you used 600g of koh.
80 litres of oil using a base of 7gpl gives you 560g. Bearing in mind 30 ltrs may be partially converted, you've most likely grossly overdosed on the catalyst. You seem to be working on guess work, and then asking what's gone wrong without advising the full history of the process.
Simply throwing "about" X number of grams of catalyst into oil of unknown quality along with some methanol will get you nowhere.
My best recommendation is to read the wiki from start to finish, UNDERSTAND and HEED the advise therein. It's been put together by many people with, collectively decades of experience. Most importantly pay attention to safety, cutting corners while playing with dangerous chemicals and equipment could, and most likely will, have serious consequences.
You really need to UNDERSTAND what you are doing before you go any further.
