Why does it say this?

Sorry if this is a dumb question but,

https://preview.redd.it/vrjjoj4bxtkd1.png?width=1090&format=png&auto=webp&s=e72e31ded6c8a6de3a104c2db4e4eae8b16991d2

it gives me this on this mission in Plankerton.

https://preview.redd.it/q3km2lvextkd1.png?width=1920&format=png&auto=webp&s=410202af906a51896cdec3036fe531d98384bdfe

Is it because of fill? Why would that be the case? How does that make any sense?