Why do most precooked frozen fries smell bad and what to do about it?

Something like 4/5 of frozen fries brands in the store essentially smell like synthetic piss to me when you start cooking them and it doesn’t go away. They taste fine but the smell is just vile. This isn’t just one or two bad experiences I’ve had but its been a trend as long as I can remember.

The other 1/5 brands don’t smell bad, yet have the exact same ingredients – potato and some mixture of plant based oils, usually palm and/or rape seed. The price range seems to make no difference, I’ve found examples of either smelling or not smelling in both cheap and expensive brands. Uncooked frozen fries never smell bad, even if they have oil already included, this makes me think its something to do with the cooking process.

Does anyone have an idea as to why this is? And if there’s anything I can do about it?