Open the attached project Leo_Yau_Contour_Labels_Reposition_MT.opju.

? The contour plot is labeled and some labels overlap.

Click the layer-level MT and click the Reposition Labels toolbar button.

? The labels are properly repositioned so there is no overlap.

Click File: Export Graph and export (e.g. as PNG file).

Open the PNG file and note that the labels

==> which were repositioned, have reverted to their original condition and they now overlap (see attached PNG file Leo_label_reposition_test.png for comparison).

Reopen the opju, press F5 to refresh.

==> more contour label showed.

Reopen the opju, duplciate the graph.

==> more contour label showed on the duplicated window.

Fixed in Origin 2023.