Accepting my own offers(CAT to XCH) has caused to lose 15.36 XCHs from my ChiaWallet!

[Yongling01]

Dear ChiaWallet Developers,
Recently, I encountered a big trouble when using OfferBin to exchange. I'm eager to get your professional guidance. Thank you very much in advance!
The approximate process of this event is as follows:
(1) First, I created three offer (CAT to XCH) in ChiaWallet/ManageOffer several days ago and successfully shared it on OfferBin

(2) Yesterday (January 18), I mistakenly clicked "Accept Offer" when viewing above three offers in ChiaWallet/ManageOffer. After that, I soon found that my 15 XCHs in ChiaWallet disappeared.

(3) Then, I canceled the previously created three offer (CAT to XCH) in ChiaWallet/ManageOffer, however the 15 disappeared XCHs have not been returned back till now.

I want to know what actions should I take so that the 15 XCHs can be returned to the original ChinWallet as soon as possible?
Appreciate your guidance and support.

I had more than 15.4XCH before I clicked "AcceptOffer (CAT to XCH)" by mistake, and now there is only 0.1 left in ChiaWallet.