I run into this quite a bit. I questioned it a couple years back, and Bradley answered saying it uses your earlier query. What else could it do?
Here's the situation I encounter:
1. I'm in Qumran Sectarian Manuscripts (Abegg). It's tagged; I'm wondering how someone translated 'pious ones' at 4Q398 17 (example)
2. I right click the hebrew, it picks up the lemma, and I select search this resource (to get comparables)
3. It builds a query, All Morph Text , Exodus (the Bible!), in NA27 w/Apparatus (the NT!). We're not remotely in the ballpark.
Now, if I right-click the same hebrew again, same search, it fills it in correctly. Obviously not using the earlier search, just seconds back.
I already tried the bug? route. I just think there's a problem, first in L6 and now L7.