Hello Pedro,
I don't know if you discover the reason, but this my answer:
Like says in the link related to this plugin: https://www.outsystems.com/forge/component-overview/1500/ciphered-local-storage-plugin, if you update an existing app to use this plugin will fails, and you have to unistall, and install the new version. This is because the device will try to open the existing database, but it will fail, since it is expecting a ciphered database instead.
But if after that push, all the users have the app with the plugin, this will not happen anymore.
I use this plugin in my app, is annoying the first time that you deploy, but after that you don't face the issue no more.
Camila