Geissele national match won’t reset with match spring ?

[BurtG]

Putting a new Geissele national match trigger in a rd15 lower. Trigger won’t reset with match (lowest weight) spring in. Works fine with next higher weight(dmr) spring. ?

Ideas?

Seems like trigger is free in lower doesn’t seem to be binding

Have same trigger in another gun with 2 lb first stage and 10 oz second. DMR spring doesn’t compare