In the first one, the curve of the "r" is slightly more pronounced than the curve of the "n", especially right next to where they connect, so it creates a subtle separation effect. On the "m", the curves are both identical. It is really hard to see though

Wow I did the same thing. Then I started to doubt myself

That's right, you are in c/keming, the official comm for learning about keming, the spacing and smooshing of nearby letters.