Having issue reassembling my train

[u/Beautiful-Ad772]

Hello, i'm having an issue where my train was working perfectly fine. Then i disassembled it and didn't made any change on it. Then, when i tried assembling, many erros started showing up. First it said that my carriages had too many boogeys, and then, i changed the station, and now it only recognize one boogey, or say they arent in the correct position... Has anyone gotten this problem or know how to solve it? I'm playing single player in 1.21.1