I haven't looked into Deepseek specifically so I could be mistaken, but a lot of times when a model is called "open-source" it really is just open weights. You can download it or train other models off of it, but you can't actually view any kind of source code on how the model works.
An audit isn't really possible.
There's also a "r" in the first half of the word, "straw", so it was completely skipping over that r and just focusing on the r's in the word "berry"