This might explain the problem I am having in my community gardens, I have two. Normally, when I send my sims to harvest I click on a couple of plants and off they go, harvesting the whole garden.
Now, no matter how many I click on, they will harvest just that one and then go off to read a book or get a drink. I have to send them to each plant, one at a time, when I want several plants harvested.
I am still tweeking them and when finished I will make them available for everyone to see and give me any tips, I am always open to suggestions. Doesn't mean I will follow all of them, but do listen.