It is possible that the bleach might have eaten through the PUL cover but it is too soon for that.
I suggest you check if the inserts are absorbing.
You can test absorption by putting a few drops of water on fresh insert.
If it absorbs immediately then you are fine but if water starts beading up, that means the inserts are repelling which could cause leaks. If your diapers are repelling, here are some suggestions direct from the Fluff Love University website: http://www.fluffloveuniversity.com/troubleshooting/what-to-do-about-leaking-diapers/
If the inserts are absorbing well, then you might just need more absorption, in that case please use another large insert with the regular one or add another small insert on top of the large/small snap-in combo.
The following link can give you a comprehensive look at why your diapers might be leaking: