You live and you learn Ivan 🙂
"ИСКРА, род. искры; мн. искры, род. искр и в профессиональной речи искра, род. искры". Cited from "Словарь трудностей произношения и ударения в современном русском языке" by K. S. Gorbachevich.
Languages develop and evolve, it's better to keep up than insist that everyone not practicing 1950s Moscow dialect is illiterate and uneducated 🙂