You should have primed the patches allowed that to dry and then hit the patches with the semi-gloss before you painted the entire wall.
The reason I am saying you need to sand the entire wall is that you need to get the the same finish and hold out on the entire wall to get rid of the dull spots where you repaired the wall.
I am having the same problem with the house we just bought and painted, but I did primer the whole wall before putting the finishing paint on. Have any suggestions.
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