There were probably 2 extra windows opened
for the same workbook (via Window > New Window)
Try the steps below to restore things to "normal"
Click Window > Arrange > Tiled > OK
Now click the "x" button in the top right corner of each
window to close it until you are left with only one.
Then click the "maximise" button to the left of the "x" to
maximise this last one.
Save the file.
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