Thanks! Yes, the Trigger Chain mechanic will be changed in a coming update as it's currently too confusing. Submit will activate once the right words are selected. For now, here's the answer since it's really hard to get past.
First Trigger Chain: "stage two" "round four" "mystery" "solution"
Highlight words for the second Trigger Chain: "doctor" "kips" "chemical" "liquid" "poisons" "olfactory"
Good news! I managed to replicate the bug with the Gallery and I've hopefully fixed it. That will be coming in the next update. :)