Sorry you're having trouble!
sometimes whenever I tap on a word it randomly pick and choose a bible dictionary or randomly choose a lexicon. Yet when am online it s sticks to one lexicon which is VCEDOTNT.
When you select a word that doesn't occur in your downloaded lexicon(s), lookup will find the word in a dictionary (system dictionary if needed). Make sure that the lexicon(s) you'd like to use are downloaded.
Is there a way to choose a preferred lexicon for offline lookups just as we choose a preferred bible.
I believe this is determined by your resource prioritization (done only in the desktop library; do you have a desktop installation?).