Same issues here. But, I don't use any of mods though.
Here is the list I found that have this kind of issue.
<Assorted Items disappeared after a raid >
7.62x39mm BP gzh (59e0d99486f7744a32234762) >>> Prapor
12.7x55mm PS12B (5cadf6eeae921500134b2799) >>> Prapor
9x39mm SPP gs (5c0d668f86f7747ccb7f13b2) >>> Prapor
5.7x28MM SS190 (5cc80f38e4a949001152b560) >>> Prapor
7.62x51mm M61 (5a6086ea4f39f99cd479502f) >>> Peacekeeper
.300 Blackout AP (5fd20ff893a8961fc660a954) >>> Peacekeeper
CQC Osprey MK4A plate carrier (Protection, MTP) (60a3c68c37ea821725773ef5) >>> Peacekeeper
Team Wendy EXFIL Ballistic Helmet (Black) (5e00c1ad86f774747333222c) >>> Peacekeeper
Ops-Core FAST MT Super High Cut helmet (Black) (5a154d5cfcdbcb001a3b00da) >>> Peacekeeper
Ops-Core FAST multi-hit ballistic face shield (5a16b7e1fcdbcb00165aa6c9) >>> Peacekeeper
Team Wendy EXFIL Ballistic face shield (Black) (5e00cdd986f7747473332240) >>> Peacekeeper
Team Wendy EXFIL Ballistic face shield (Coyote Brown) (5e01f37686f774773c6f6c15) >>> Peacekeeper
Team Wendy EXFIL Ear Covers (Black) (5e00cfa786f77469dc6e5685) >>> Peacekeeper
Team Wendy EXFIL Ear Covers (Coyote Brown) (5e01f31d86f77465cf261343) >>> Peacekeeper
IFAK individual first aid kit (590c678286f77426c9660122) >>> Therapist
HighCom Striker ULACH IIIA helmet (Desert Tan) (5b40e2bc5acfc40016388216) >>> Ragman
HighCom Striker ULACH IIIA helmet (Black) (ULACH) (5b40e1525acfc4771e1c6611) >>> Ragman
Moreover, there are no items on the traders' assort database such as,,,
Mk-18 Mjolnir (5fc22d7c187fea44d52eda44) >>> Jaeger
Ars Arma CPC MOD.2 plate carrier (5e4ac41886f77406a511c9a8) >>> Ragman
Magazine case (5c127c4486f7745625356c13) >>> Mechanic
I just want to know how to fix it. Pls tell me! 
