Strange - you don't have any walls either. It looks like you are using the "per model settings" feature on the left side of cura which overrides infill settings. Is that possible? It's here:
Anyway if my first and second guesses are both wrong then you need to attach the project file please. Do "file" "save project..." and post the result in this topic or post it to some sharing site like dropbox/google drive and post a link to it. That will let us see your STL file, how you scaled and placed it and all your settings.
Other possibility: "gradual infill steps" might not be zero.
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gr5 2,224
Can you show a screen shot of the model in normal view and layer view please?
Make sure if you are printing with extruder 1, the infill is set on extruder 1 (blue border pointed to by red arrow below). Make sure the name of the setting is the same as shown below.
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