It’s recommended that veggies shouldn’t be fed until a rabbit is 12 weeks old, and you really have to be careful about giving fruit and carrots due to the high sugar content. It is very good that they are eating hay. It may be that their digestive systems aren’t developed enough to handle all the veggies and fruit, and that is making the male have somewhat soft or messy droppings and the gurgling noises.
Here are 2 good articles on feeding vegetables and fruits. Note that spinach is one of the veggies that should be limited, and not given every day, even to an adult rabbit.
http://rabbit.org/suggested-vegetables-and-fruits-for-a-rabbit-diet/
https://binkybunny.com/BUNNYINFO/VeggieList/tabid/144/Default.aspx
A vet visit would be a good idea. Both bunnies should be checked out and you should discuss their diet with the vet. The male may need some medication, supplements or probiotics to help with his apparent GI problems. The vet may recommend that you cut back on the greens and fruit and concentrate on giving them hay. Or start slowly introducing some other greens, such as romaine lettuce, green or red leaf lettuce, kale or cilantro, or any of the greens that are most recommended from the lists. You may want to try some other brands of pellets – just the plain kind with no seeds, nuts or colored bits in it. Pellets do have vitamins and nutrients that are important in a growing rabbit.