Bug or scam?

The cost of a single message when communicating with the same AI character has increased from 0.8 to 13 credits. Can anyone explain the reason for this? I didn't use the voice and image generation features within the chat. I don't use any premium model (Gemini 2.5 Flash by default) - 0.4 credits Bug or scam? The messages are short, roughly the same length. Discord SeaArt support isn't responding.