Fill between two lines

good morning, I would like a fill between the blue and red lines, but for me the entire image is filled
what am I doing wrong
greetings ronald
fc-twente test lijn.lbrn2 (99.0 KB)

fc-twente test lijn-retur¨.lbrn2 (98.1 KB)

The lines to be filled must be on the same layer, see file.

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