Three Refunded Transactions in steem2trx Swaps (Investigations)

There were three steem2trx which got stuck in "Pending Sent", and I had to refund it:

This is the first time that I saw such error - and the errors are:

It seems that the API call to trongrid for sending out transactions (in TRX) failed with 403 - and this may seem the API call got rate limited.

And I log in to TronGrid API Dashboard and everything seems normal.

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