For your glycan issue in density plot, you need to choose a unique atom name for that segment/segname. There is no CA atom name in that segment.
(See below).
ATOM 10891 C1 BGL C 1 -5.969 11.970 4.455 1.00 0.00 CARA
ATOM 10892 H1 BGL C 1 -6.221 12.351 3.442 1.00 0.00 CARA
ATOM 10893 C5 BGL C 1 -6.818 13.968 5.376 1.00 0.00 CARA
ATOM 10894 H5 BGL C 1 -7.043 14.270 4.331 1.00 0.00 CARA
ATOM 10895 O5 BGL C 1 -5.733 13.039 5.377 1.00 0.00 CARA
ATOM 10896 C2 BGL C 1 -7.129 11.170 4.987 1.00 0.00 CARA
ATOM 10897 H2 BGL C 1 -6.869 10.806 6.003 1.00 0.00 CARA
ATOM 10898 N BGL C 1 -7.429 10.035 4.142 1.00 0.00 CARA
ATOM 10899 HN BGL C 1 -8.135 10.207 3.460 1.00 0.00 CARA
ATOM 10900 C BGL C 1 -6.949 8.806 4.296 1.00 0.00 CARA
ATOM 10901 O BGL C 1 -6.066 8.543 5.108 1.00 0.00 CARA
ATOM 10902 CT BGL C 1 -7.537 7.757 3.394 1.00 0.00 CARA
ATOM 10903 HT1 BGL C 1 -6.801 7.486 2.607 1.00 0.00 CARA
ATOM 10904 HT2 BGL C 1 -8.459 8.146 2.912 1.00 0.00 CARA
ATOM 10905 HT3 BGL C 1 -7.794 6.856 3.991 1.00 0.00 CARA
ATOM 10906 C3 BGL C 1 -8.341 12.074 5.120 1.00 0.00 CARA
ATOM 10907 H3 BGL C 1 -8.606 12.474 4.118 1.00 0.00 CARA
ATOM 10908 O3 BGL C 1 -9.462 11.326 5.574 1.00 0.00 CARA
ATOM 10909 HO3 BGL C 1 -9.837 10.957 4.772 1.00 0.00 CARA
ATOM 10910 C4 BGL C 1 -8.019 13.271 5.979 1.00 0.00 CARA
ATOM 10911 H4 BGL C 1 -7.754 12.913 6.997 1.00 0.00 CARA
ATOM 10912 O4 BGL C 1 -9.039 14.273 6.036 1.00 0.00 CARA
ATOM 10913 C6 BGL C 1 -6.379 15.193 6.132 1.00 0.00 CARA
ATOM 10914 H61 BGL C 1 -7.086 16.027 5.933 1.00 0.00 CARA
ATOM 10915 H62 BGL C 1 -5.363 15.498 5.802 1.00 0.00 CARA
ATOM 10916 O6 BGL C 1 -6.405 14.875 7.518 1.00 0.00 CARA