Disassociation of synthetic amino acid after docking

Hi,
I ran a protein-peptide docking in Haddock webserver, In result the synthetic amino acid showing disassociation with the peptide . Can I know the reason and how do I solve this problem? Thanks!

The list of supported modified amino acids can be found at:

[

HADDOCK Web Server - Settings
science.uu.nl

favicon.ico

](https://rascar.science.uu.nl/haddock2.4/library)

A non-supported modified amino acid defined as HETATM will not get connected to its neighbours and as a result they might “fly out”