Good Afternoon jenmcolon,
It looks like you're looking for assistance with an unrecognized charge, so let's see how we can help with this.
If you're needing assistance with checking your purchase history from your Apple ID, take a look at the following resource.
See your purchase history for the App Store, iTunes Store, and more
If this isn't helpful with what you're looking for, it'll be best to contact Roblox for assistance with locating the charge as you state you have multiple accounts. This may not be something that Apple is able to locate or isolate, so reach out to Roblox via the following link.
Roblox Billing
We hope those resources are able to help.
Have a great day!