I am using lightning core and I had a force close channel with an active HTLC, funds were sent from this address bc1qca5lwlfv8qzkchcfqdryfl89szuk2n0c3x2p7vt4gst04keygkns4x68hh to myself (bc1qf7nh8pwt30nxueqekrhapa3wyz98zxu58rfl8l and have been spent) and after the expired HTLC (3 days later) funds were sent to the same address of force close (bc1qca5lwlfv8qzkchcfqdryfl89szuk2n0c3x2p7vt4gst04keygkns4x68hh).

Since then funds are stuck and I see in logs that is doing a RBF onchain of txid that I can not find and keeps increasing the fee (just showing two examples on logs fees going from 2728 to 14841):

Apr 10 15:59:39 nixos lightningd[1311]: INFO 021cb32426ed1a6be9533801e7c56a70ffc1c360a3a31819c3ae0a72e141d78000-chan#6: RBF onchain txid 7114510a6756715ddbed679f3c3f5787033780a800a3ef402033ee09d82630e0 (fee 2707sat) with txid ea512e00228263f53ae143416324a04b28e9381217400191ea7a031e343441c0 (fee 2728sat)

Apr 10 18:35:54 nixos lightningd[1311]: INFO 021cb32426ed1a6be9533801e7c56a70ffc1c360a3a31819c3ae0a72e141d78000-chan#6: RBF onchain txid 8d83a77b59a36f893d693e467f6e64434bf205337176113a9b569c27c0f12c78 (fee 14840sat) with txid 51eb15bc8541358912d23493b16ad9d38cac48f9a41f72ba2c05c83d6da29152 (fee 14841sat)

I would appreciate if someone can explain me why my node is doing this.

Thank you