Wierd lighting glitch on dark places like caves even you place a torch or etc.

When I was gone caving, it was too dark and start placing some torches and this happens (See Attachments), it basically lights up the place weirdly

Steps To Reproduce
1. Find dark places like caves, or etc.
2. Start lighting up the place using lighting item such as torches, glow stone or etc.
3.Even though you light the place up, some parts of the place are dark.