Why is Mumbai - London - Dallas - Denver more expensive than Bangalore - Mumbai - London - Dallas - Denver? [closed]

I tried looking for a flight from Bangalore to London and London to Denver.

Bangalore to Mumbai. 16 hour layover. Mumbai to London. London to Dallas. Dallas to Denver. ----- 48K

When I searched for Mumbai to London and London to Denver:

Mumbai to London. London to Dallas. Dallas to Denver. ---- 54K

Why is the second option costlier when its actually one flight lesser than the previous one.

The flights are for the same day and same flights. I have verified that.