Hey Faria
Thank you for your your speedy response. Unfortunately de-activating all plug-ins is not a viable option. Nor do I believe it would help at all as the RESTful API aspect seems to work fine. This looks very much like an application issue with your plug-in, most likely related to wildcard characters.
It has added a rule, which is now not visible in yur UI. Even if I download all rules using your JSON export it is absent. This points to an issue within your application, the rule is being omitted at some point in display and export process.
I hope this helps.
Regards