The above are images from what I believe are the same test protocol.
First ramp is different...
I believe because of the difference in FTP informing it
Ah, I see - they are setting the initial starting level slightly differently between the tests.
That seems like a poor decision, but given its at such a low intensity it shouldn't have much bearing on your overall result.
That's the warmup. The ramp should be the same each time. If they're not it's not a proper Ramp Test. What wattage is the first (non-warmup) block at in each?
Checked what?