Indeed it does, unfortunately a decision was made many moons ago to only service phpfina (fixed interval) feeds in the emoncms apps!
Only 8 of the feeds you list are phpfina, the others are not expected to be listed.
You can hack the app module code to show other feed types, but that will then block future updates to the apps module via git.
As to why only 6 of the expected 8 are displayed, I suspect you may have some duplicate feed names, this is widely acceptable across emoncms, most of the code uses a combination of group (tag) and feed name combined to determine if it’s unique or not. However, the app module is somewhat behind in that respect as it cannot handle duplicate feed names and it only displays the last found of each name (in feed id order) so only the most recently created of each name phpfina feeds display.
Do you have any other feeds named “Grid Watts” and “Grid kWh” ?
You must therefore use unique feed names to make full use of the app module, this is in conflict with the device module and emonhub as they are designed to use consistent naming.
See Apps feedlist issues and Does emoncms expects data to be send reguarly? - #2 by pb66