I made a change to my cadence yesterday. Moved it forward 5 hours. When I came back to it after realizing the cast hadn't deployed I saw it was still on the original cadence time.
Today I changed my testing campaign from cadence M, T, W, T, F to only M&F. When I just checked it was reset to M-F not only M&F.
There are bugs. Have you created a ticket about this already?