Salvaged Sparks disappearing

I got spear of lycander in vessel as first mythic. I salvaged it and then forged another mythic with the spark, wasn’t able to use that mythic either. Salvaged again and the spark was in my items and materials section, but forging said I didn’t have enough sparks (0). The game patched and then I had 0 in my items and materials section. What is happening here?