Letters joining even after lock

Hi, I have a problem with InDesign for Kannada Unicode font. When we type words Like Busnalli (Means: In Bus) in Kannada as ಬಸ್‌ನಲ್ಲಿ, it is correctly demonstrated in MS word, Browser and all over. but when i call it into InDesign it will add Busnalli as ಬಸ್ನಲ್ಲಿ. Just like Carnalli (Means: in car), ಕಾರ್‌ನಲ್ಲಿ- ಕಾರ್ನಲ್ಲಿ., Fonts (ಫಾಂಟ್‌ನಲ್ಲಿ- ಫಾಂಟ್ನಲ್ಲಿ), Internet (ಇಂಟರ್‌ನೆಟ್‌- ಇಂಟರ್ನೆಟ್‌), etc.... The font developer saying it is the problem of InDesign.