Swaps have always been hit and miss. Your best option is to withdraw them off Mutiny and into another wallet. Try throughh LN, if that doesnt work, on chain.

nostr:nevent1qqsx27ey4wslzqvnda4j6yk0k3dkdfjj5kzt6404qg5jct6ny54d24gprpmhxue69uhkummnw3ezuendwsh8w6t69e3xj730qgsdqnk0xw3s8fvc2t7mdq0d3dqjyqd6shvdyxv6a3eukcngr4324yqrqsqqqqqps78484

Use smaller transactions. I’ve been able to swap with 50k transactions no problem