By Seamus Duff Love Island: All Stars fans were aghast on Sunday night when the past contestants from the season returned to the villa to give one of the final couples the boot. And in nominating the pairing that they found least convincing, the returning reality stars may have tipped fans off about a bitter feud. For the past five weeks, a string of familiar Love Island contestants have returned to the villa for a second chance of finding romance in the sunshine. Arabella Chi and Adam Maxted, Anton Danyluk and Georgia Harrison, Callum Jones and Jess Gale, Josh Ritchie and Sophie Piper, Toby A…