In the future we will see how we build our iso’s but today July 2019 the linux kernel is on the iso as fallback and your linux-lts is doing all the work.
If you want to get rid of the linux-lts (often because part of your hardware is unsupported) you can delete it, using one of our scripts
/home/$USER/.bin/main/delete-lts-kernel-v3.sh
That will delete the linux-lts kernel and the linux kernel will take over.