Duplicate purchase issue in Steam version

We recently discovered a duplicate purchase issue in the Steam version for [One-Time Offer] packs. After our investigation, we have determined that this issue was caused by clicking the buy button multiple times under a laggy connection.

To prevent any unnecessary losses, please be patient when buying a [One-Time Offer] pack, and do not click the button multiple times to ensure that you are not billed again.

Thank you for your support and understanding.