When I first logged in in the morning, the seal showed 6 purity seals. When I tapped generate it showed I only had 1.
The database isn't wrong as to how many you had, but most likely you needed to refresh to see it accurately.
If you checked after 9am pacific time, your purity seals were most likely auto neutralized by how many plague you had.
"Stupid questions make more sense than stupid mistakes."