Weird Step Climb anomoly

[tbarker1989 1]

I took off from KEDW to PHNL. My initial altitude was FL380. I had an initial step climb planned to FL400 and a later step climb to FL430 along the flight. I stepped up to FL400 with no problem. I then step climbed up to FL430 when it said to but when I dialed FL430 into the MCP it changed to showing this. Later after I was no longer speed limited it corrected itself to showing correctly. Is this proper operation of the FMC?

Edited December 29, 2018 by tbarker1989

[scandinavian13 5,192]

2 hours ago, tbarker1989 said:

Is this proper operation of the FMC?

Unsure, but I can't help but notice the 0 in the STEP SIZE field. Why is this?

[tbarker1989 1]

I put that in trying to diagnose the problem. It was set to RVSM before. I changed that after I got up the FL430.

[pracines 823]

With a MAX Altitude of 431 the FMS actually called for a step to 430? 

That's even more strange. 

[tbarker1989 1]

The FMS did eventually right itself when I was no longer speed restricted. After the inital climb I was speed restricted to like M.865 or so with an increase in speed every so often. I was set for M.88, once the aircraft was able to do M.88 it righted itself and showed FL430 instead of FL400.