So the fiber content is low. The ingredient list is important too. I couldn't find one for those, but those types of feeds are usually not made with high quality ingredients and usually use higher amounts of processed grain by products, which is what causes these types of problems, along with possible ingredient contamination.
I'm not exactly sure what's available in Canada but I would suggest looking at higher quality pet feeds like oxbow, science select, etc. No muesli mixes, just plain pellets. You want something with at least a minimum of 18% fiber, 15-17% protein (only while a junior), and with alfalfa or other hay as the first ingredient. You don't want a grain product being the first ingredient. Science select junior, oxbow garden select young rabbit, and oxbow essentials young rabbit all fit the bill, with the garden select being the best in my opinion. There are others, I just don't know what they will be for where you are. Hopefully an RO member from Canada will chime in.
They are higher priced but I feel they are safer and there's less chance of causing problems. Those lower quality bulk feeds use inferior ingredients and there's a greater chance of quality control issues occurring that could pose health risks. I don't know about in Canada, but it happens here in the US often enough with other bulk brands, where the feed is inadvertently mixed with something harmful or with a toxic vitamin ratio, causing massive health problems and even death when a bad batch of feed occurs. To me it's worth paying extra, just for piece of mind, but also it's better for my rabbits health.