Hi, tjersak, and welcome to the AnnoZone!
Perhaps it could be helpful to post a screenshot of your harvest/growth problem.
You checked transportation problems or full warehouses?
The forum search gave no results or similar questions - only one hint from GabiB, that the farmers and pickers don't walk over crippeled fields (in case you don't have 100% fertility). There you should erase those fields and set pathes there.
Whether it is an installation problem - I don't know