Diagnosing cause of electrolytic capacitor failing
230V AC swings between +230V and -230V RMS, but that means it reaches +/- 325 V peak-to-peak. With a rectifier, that's between 0 and 325V, which split on two 200V capacitors would be just about enough -- except the capacitors have to be perfectly matched for that to be true.

If there are differences in manufacture, then the ESR of the capacitors will be slightly different, and one will see more voltage than the other.

Also, there may be a max amperage for the capacitor, and given that a capacitor is akin to a short when it's empty, you may get too much surge current (check the ripple current rating of the capacitor data sheet.)