Where? (Circle it on the screenshot)

I would have to go with the fact you have asteroids and a planet on the same tile as a the bug. Hense the graphic glitch, should only be one object per tile.

Study the Durantium Cloud is a specific Precursor planet trait event that would not of fired for a Toxic Planet, it only fires for the Durantium Cloud planet. If it did (which I doubt since it has a weight of 0).....that is a bug.

You should merge or get a moderator to merge both these threads, it is the same issue. Caused by the changing of a Planet Trait mid game (which I am now going to have to check out how they do, cause that is a handy thing to know ).

One thing is also worth noting.
When a planet is transformed into a toxic planet following a Korath invasion with a spore ship, the planet loses the bonuses and the penalties given by the starting trait.
In this case, the planet "Indari III" with the starting trait "Durantium Cloud" has lost the bonus "Raw Production +1" and the penalty "Food -25%" has been removed (there is also the penalty "Synthetic Pop Cap -50%" but it did not apply in this case).

So be careful when playing the Koraths not to stupidly lose important bonuses with an invasion with a spore ship.

It would have been preferable if the planet had kept all of its previous bonuses/penalties in addition to those given with the Toxic trait.

Edit: This specific bonus is also lost... ...if the tooltip is correct.  
"Shipyards sponsored by this world gain a bonus to any Mass Drivers ships produced."