It probably means that you have enabled the “everything feed” in liftoff settings. This aggregates content from all instances apparently, even those not federated with yours.
Edit: weird cause you seem to be on sh.itjust.works which is federated with Lemmy.world.
Easily collapsible comments plus children , UI tweaks , accessibility enhancements, multi account support (with feed grouping) are some possibilities that people enjoyed on Reddit through 3P apps.
You have one user and has many comments and post as you make yourself. This means that your suspicion score is going to be extremely low (under .5 if you post 2 times on any server).