In Weblate translations are organized into projects and components. Each project can contain number of components and those contain translations into individual languages. The component corresponds to one translatable file (for example GNU Gettext or Android string resources). The projects are there to help you organize component into logical sets (for example to group all translations used within one application).
Internally, each project has translations to common strings propagated across other components within it by default. This lightens the burden of repetitive and multi version translation. Disable it as per Component configuration, still producing errors for seemingly inconsistent resulting translations.