Zwillingssockel 36 armor seems to be coded wrong. I'll use the example of satchel.
Satchel explosion gives 60 dmg of "Shell_10KG_HE" material. Zwillingssockel 36 armor uses "Blast_sensitivity_softobject" material. The modifier for 392 vs 71 is "1", therefore satchel inflicts 60*1 dmg to Zwillingssockel 36, which has 500hp. The result is that we need 9 (!) satchels to destroy quite light double mg stand.
EDIT: Of course satchel is not the only case, most infantry explosive anti-tank weapons, like geballteladung or sticky use that material.