There is a bug that causes the light to not render correctly. It basically creates a line of where its light and dark, even though there should be sufficient lighting in the dark spots.
In the pictures I have attached, the path is lit the same way all along it, yet there is a complete section that has no light, and immediately next to the path is dark, where it should also be light. When going back and forth along the line, it is as though a light switch is being turned on and off.
This causes mobs to spawn along my path, as it doesn't register as having a high enough light level, even though I am using slabs with light sources beneath. Placing a torch will fix it until you leave the area and the chunk re-renders
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We're actually already tracking this issue at MCPE-58182, so I will resolve and link this ticket as a duplicate.
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I've been seeing similar issues with lighting. Sometimes, it almost looks like smooth lighting is turned off, when it isn't. More common though is that light doesn't travel vertically and then horizontally. So, for example, if a torch is place at Y 67, there will be no light from the torch going up to Y 68 and over to the top of the horizontal blocks next to it.
To deal with the bug, I've had to place another torch at the higher level nearby and break that torch. Doing so seems to update the original torch's lighting, and it works correctly (for a while). Hope this makes sense. But, it would be nice if the bug got fixed cause it definitely affects the looks of the game and even other mechanics, as well.