They're probably following Sony TV's example.
Like Sun TV, Sony TV too used to have their logo on the bottom right corner. But after year 2000, they went for a graphics change and shifted the logo to top right corner.
Now after so many years, Sun TV's channels are slowly ditching the bottom right corner. It started with Sun Bangla, Sun Marathi and Sun Neo. Now with Gemini TV joining them, it won't be long enough to see Sun's other channels ditching the bottom right corner.
I don't know whether it's a bad move from the network or not, but considering that many news channels have their logos on the bottom corners (DD News and DD India are perfect examples of this), they should have kept the position as it is.