Defensive strengths
>needs the addition of poison (bugs commonly use poisons and chemicals e.g. ants, bees, spiders, bombardier beetles, etc.)

Defensive weaknesses
>Make sense nothing wrong here
>Maybe the addition of steel weakness

Offensive strengths
>Needs the addition of fairy (cute, cuddly pink things are almost always preyed upon by bugs in any form of story or tradition)

Offensive weaknesses
>Ghost needs removing (no real relationship between the 2)
>poison needs removing (to make sense with the defensive strength addition)
>Fairy needs removing (to make sense with the offensive strength addition)

I believe these changes would reflect how bug should be. Any one who has been stung by a bee or bitten by an ant or water beetle larva can attest to them not being lacking in the attack department.