https://psteamcommunity.yuanyoumao.com/groups/CSGOHandouts#announcements/detail/1657760671810626394

"If you see an offer that says "credited" on an offer wall, and you have not received the coins for it - that means that specific offer is being held.
Do not think that we have scammed you, it's just a precautionary measure due to the exceeding amount of scammers present on our site lately.

A notice will be added (hopefully) on site in the FAQ page (i believe) to let users know as well.

The amount for how long an offer can be expected to be held is currently unknown. It can either be a few days, a week, or up to a month."