I am pretty sure I already gave you more than enough assistance on another site without providing us with error logs of any sort and only going off the assumption you added everything correct.
try what I suggested before act as if you are pulling starting gear from HK3 database and send those queries to your new database if this is a database issue, remember to make a new character after you've done this.
https://forum.ragezone.com/f724/v15-...-items-686424/
follow this with HK3 database/server once you pull the values execute them on your database/server
....at least from what I recall adding my own unique inventory slot you had to add a value to the database.
Keep in mind I could be fully wrong it's just the last thing I can go off of with what you've told me thus far.