Pdb2gmx makes a handful of dihedrals without functions

GROMACS version: 2021.2
GROMACS modification: Yes
When I run

gmx pdb2gmx -f 6WHA.pdb -o 6WHA.gro -ignh -ter -water spc

answering gromos54a7 for ff and 2 (None) for all caps (since pdb is already capped via Prime), the resulting topol_Protein_chain_A.itp has a handful of strange dihedrals that are conspicuously placed and missing functions. This of course causes problems down the road. I can supply the pdb if that helps. Has anyone seen this or have a thought on how to address this? Thank you for your help.
topol_Protein_chain_A.itp:

...
623 625 628 630 1 gd_42
623 625 628 630 1 gd_45
247 246 248 249 1
247 246 248 250 1
625 628 630 632 1 gd_14
628 630 632 634 1 gd_43
...
1427 1429 1432 1434 1 gd_42
1427 1429 1432 1434 1 gd_45
539 538 540 541 1
1429 1432 1434 1436 1 gd_14
1432 1434 1436 1441 1 gd_43

Hi,

That means that the corresponding dihedral potentials are not explicitly defined in the force field files. You can add the missing potential directly in the *.itp if you know the appropriate potential. For the syntax see File formats — GROMACS 2021.2 documentation

best regard
Alessandra

Thanks.