Hey,
what version is this on?
We recently fixed an issue on this (NXT-3229). I briefly tried to reproduce the situation of your screenshot by installing some NodePit extensions and they now, too, appear to be categorised correctly.
This fix will be in the next bugfix version (5.4.1) and, of course, in the next 5.5 release. If you want to try to the change immediately, you can also download a nightly build.
If there’s anything still off, let me know.
Best,
Ben