Investments/purchases will only be made when there are NEW matching loans listed at the Marketplace. Investments are NOT made retroactively into loans available for funding prior to your account being setup with the new strategy.
This restriction is in place to help reduce instances of adverse selection - whereby the loans which are still available for funding are potentially lesser quality than newly available loans.
However, if you wish to purchase these loans, you may do so manually through the respective marketplace and all future purchases will be made automatically.