When the Rifleman default equipment consist of non-unlimited items A, B, C, but there is no free C available when hiring a new recruit, you still lose A and B.
Example:
1. Rifleman default equipment: Jackal armor, Plasma rifle, Plasma pistol (random example)
2. Have 5 Jackal armor, 5 Plasma pistols, 0 Plasma rifles in store.
3. Recruit 5 new soldiers.
4. There was not enough equipment for new soldiers so they got the basic default load-out of Ballistic rifles instead (with no armor or pistol).
5. All your 5 jackal armors and 5 plasma pistols have now vanished regardless.
So far I have been able to always reproduce this, but a testcase save game is nevertheless attached. Rifleman default equipment is set to mag rifle + jackal armor, and there are 0 mag rifles and 4 jackal armors. If one recruits a new soldier, you lose 1 jackal armor.
equipmentbug.sav
equipmentbug.sav