Might be an issue with how coinb.in calculate fees/byte. Could you paste the raw TX here?
02000000000101a7fe8ba463c9cd400097220533d7c81b02a0104e3a760c4bbb933eaa9ebdedaf0
000000000fdffffff0162d8010000000000160014dadcd7f1cd1b11c3a69f61585f003395ec8a99
550400473044022056b0b1deb00b4f2a798623849655316b2b8cb35fb5607a162fd6cdc5b235165
702203395c5e20e5425a2eacab3c827e44083eb3fdd05398dd2213a23b551db7127680147304402
2065c5deee5467bdbcceb7974effd5ef02e62c57f75e0c7b3a085027351254c5fe022047a8caf51
45052d8f3c54d1f1d829b14cb566a0f7beba2a3dbea9a0a283cfed701475221024d34631e9abc48
8b9a9d137bc91746415acbadbe42b5122a83d514f7cf1f11482103608484ccf6e229ee06d3358c5
49e458c5a2d8c56e8b9eaa89413e3509593fdb652aeafd50900
https://drive.google.com/file/d/1stpCM-xB6DAi54OhztbHYaNs8P_2bhx4/view?usp=sharing а вот сама транзакция готовая формата Electrum
