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Flight Level problem

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I planned a flight at 34000. Upon checking the legs page before TO I found that page 2-3 the FL had gone up to 38000(why?)

But , as planned I set the MCP to 34000. After some  cruising  at 34000 the TD appeared on the nav. display. I reduced the MCP to 3000.

However, when passing the TD it did not start to descend , even though the path deviation indicator came up showing no deviation.

After quite a few miles it did start to descend and all went well.It  seemed as if the TD started as if I  had chosen 38000!

I decided to repeat the flight putting in 34000 again but as it came up with 38000 in the legs again, I set  the MCP to 38000.

I got into cruise at 38000 but I had to stop to go out- so I saved it in cruise.

Later I returned to it loaded but as often happens the panel was all wrong but I loaded the panel state from the saved state in the FMC.

By the time this happened it had lost a lot of height so it started to climb back up.

BUT- the legs p age now showed    34000!.So I set the MCP to 34000 and all went well at  the TD.

Has anyone any ideas what went wrong?



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