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MDE app on Android may function differently than an iPhone, but yes, my issue was with changing the EXPERIENCE. I changed times for a FP+ several times, and was always given a lengthy list of times to choose from.
They were never in order by time though, the list was very random. I wonder if Disney is putting the times in order based on availability (most open slots)?
When I chose the experience, the app made it look like it was for the same time as my original FP+. It wasn't until I clicked DONE and refreshed my plans that I saw the time change.