repository not getting updated, however it updates when Addons19.db is deleted

Dear all,
I have created a simple video addon & repository by following these two videos:
https://www.youtube.com/watch?v=W0xqyL0XxAo
https://www.youtube.com/watch?v=tXzPUs9FaF8

I made some changes to the addon and uploaded to my webserver, however when I launch Kodi, the addon/repository is getting updated. I have waited over 10hrs and it has not been updated. If I delete the Addons19.db file then the add/repository gets updated, it also gets updated if I manually run “check for updates”

Is there anyway to make the addon/repository auto update when launching Kodi ?

I am running KODI 15.2.

Any help on this will be much appreciated, thank you.