There is something seriously wrong if that’s the case.
Why? Aside from the difference between the bikes, I didn't establish any other common variables. I’m tall and heavy (125kg), but at the same time, I put out quite a bit of power (350W@1h). Depending on the day, I might not even feel much of a difference in intensity when riding the same route at 200W versus 260W average power. It’s very subjective. In my opinion, any comparison of frames or bikes only makes sense on the same route, on the same day, at the same power, and for the same person. And it needs to be repeated multiple times. From day to day, or even within the same day, the wind can change direction and skew the results.
I’ll just add that what I wrote regarding the times on different bikes is the truth. These results were collected over many years, during which both my weight and power output fluctuated. On the enduro bike, I have fairly fast tires, a locked-out suspension, and I usually ride in an 'aero' position (tucked in, holding the bars right by the stem).