That makes it a 175s picture of the moom then which as at 105s they would be overlapping. The moom can cover it's own width in 150s or so.
I know the ISS changes apparent speed a lot (depending on where in the sky it is).
That's because the ISS is has a low Earth orbit. Even though it's at a constant distance of ~400 km from the ground, it's distance to the viewer varies by 400 km to several thousands of kms as it travels overhead.
In comparison Lunar distance is on average 384,402 km, meaning that it's perceptible speed on the sky doesn't really vary much even if there's a difference of few thousand kilometers during the day.
Funnily enough I personally have never really noticed this change in apparent speed of ISS due to living in northern Europe. Due to its orbital inclination of 51.64 degrees, the ISS never goes overhead if one lives norther than that (or souther than -51.64). When I see the ISS slowly moving above the southern horizon from my Finnish perspective, in reality the ISS is somewhere above Poland and Ukraine, at a distance of over 1000 km.