Improper installation & blocked overflow pipe is the primary causes of leakage in Split AC's.
Check the drainage pipe & see that there are no sharp bends. If its clogged then get it cleaned. Also its better to have minute tilt of indoor unit while installation towards the drainage output opening, so that any condensation gets out easily due to gravity. Even if there is large overflows the chances of water draining from all over is less & it usually comes out from one side only...
Proper maintenance & cleaning makes sure that the condensed water is only getting collected in the reservoir.. the problem of leakage is not specific to Blue Star only..