Apparently, because you purchased the apps using a different Apple ID from the one you now use. If this other Apple ID is not yours, then whose is it? Did you purchase your device used or new? Is it a computer or an iDevice? If the latter, then what is it? If it's used, then you need to purchase your own copies of these apps using your Apple ID. If it's new, then it's probably a returned item. Make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple. Also, see How to find your nearest Apple Authorized Service Provider (AASP) or Distributor (AAD).
"Your Apple-branded or Beats-branded hardware product (“Product”) is warranted against defects in materials and workmanship for a period of ONE (1) YEAR from the date of original retail purchase (“Warranty Period”) when used in accordance with Apple`s user manuals (refer to www.apple.com/support/country). Under this warranty, you will be able to direct your claims to Apple even in situations where you purchased the Apple Product from a third party.” [Apple One (1) Year Limited Warranty – Accessory - For Apple and Beats Branded Products Only.]