For the SNMP LLD the variable

{#SNMPINDEX} ist just the last id from the OID. It would be better if it is the rest which comes after the defined SNMP OID in the discovery rule. Here is an example:

Values from snmpwalk -On:
.1.3.6.1.4.1.2636.3.39.1.4.1.1.2.1.3.5.116.114.117.115.116.5.116.114.117.115.116.14.116.114.117.115.116.45.116.111.45.116.114.117.115.116 = STRING: trust-to-trust
.1.3.6.1.4.1.2636.3.39.1.4.1.1.2.1.3.5.116.114.117.115.116.7.117.110.116.114.117.115.116.16.116.114.117.115.116.45.116.111.45.117.110.116.114.117.115.116 = STRING: trust-to-untrst

Values from snmpwalk:
JUNIPER-JS-POLICY-MIB::jnxJsPolicyName."trust"."trust"."trust-to-trust" = STRING: trust-to-trust
JUNIPER-JS-POLICY-MIB::jnxJsPolicyName."trust"."untrust"."trust-to-untrust" = STRING: trust-to-untrust

How it is:
SNMP OID = .1.3.6.1.4.1.2636.3.39.1.4.1.1.2.1.3{#SNMPINDEX}

= 116

{#SNMPVALUE} = trust-to-trust

How it should be:
SNMP OID = .1.3.6.1.4.1.2636.3.39.1.4.1.1.2.1.3 {#SNMPINDEX} = 5.116.114.117.115.116.5.116.114.117.115.116.14.116.114.117.115.116.45.116.111.45.116.114.117.115.116{#SNMPVALUE}

= trust-to-trust