Drag your eyes to the right and note that there is a separate product/service and award date. The nature of gov contracting means there is likely a base contract, and when a new job comes up (e.g. healthcare.gov) they mod the contract and issue a new award. These are 114 separate scopes of work, separate projects. ~113 of which have nothing to do with healthcare.gov.
I did see the right-hand-size description. Those different scopes of work can still be parts of the same big project. In most projects in government or/and private sector you bill for telecom services separately from software development and from system configuration and so on. Pardon for being somewhat cynical, but I am not surprised at all that they can milk the GOV for over 500 M$.