First of all, let me start off with the statement that I do not claim to know any Hebrew. I have started to recognize a few words, but that is really it. I am using Logos as a crutch. I was looking over the Isaiah lesson for Sunday and asked for a word study of the Hebrew for Mountain by right clicking on the term in the Exegetical Guide and picking Bible Word Study. I got the following report. No definition, although there were links found for this lemma in the Exegetical guide itself. Also blank Hebrew and Greek Words.

Then zero hits in NLT and Message.
It appears that it looked at the Lemma as an ENGLISH term and then ran the report based on this, finding the Hebrew in the RI's. (As a side issue, it is interesting that it picked up The Message, since it is not a prioritized book)
If I just Left Click on the the term from the Exegetical Guide, I get the expected report.
Logos 4.0.3.2197