CSGO - Tips on making the lighting on props not bug out?

Basically what the title says. When placing down various plants like bushes and all that, sometimes the lighting can look really ugly. Any tips on making foliage and plants in general look better?

Examples:

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[Blocked Image: http://i.imgur.com/3yZcVYu.jpg]

[Blocked Image: http://i.imgur.com/CZ0Mwab.jpg]

Sometimes parts are poorly lit, sometimes the lighting on the entire thing is off. The same goes for other props sometimes, but it happens mostly with plants.

Here's an example of it happening with some cinder blocks:

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[Blocked Image: http://i.imgur.com/u7HjZfy.jpg]

The sides of the blocks are lit as if they were in the sunlight directly, even though they are in the shadow.

Thanks in advance.