After some checking, it turns out I already fixed this issue somewhere
last year, but never got around to release that version. I have released
this fix (+ some other fixes) as version 1.0.2 on
http://www.lawinegevaar.nl/firebird

I did find another bug, but at this time I am unsure if it is 1) a
general DTP bug, 2) a bug in my code, or 3) a bug in Jaybird.

I did some checks having tables
TEST_TABLE
TEST_TABLE2
TEST_TABLE3

In this setup the columns of TEST_TABLE2 and TEST_TABLE3 are also listed
with TEST_TABLE. When querying for columns, the _ is sent unescaped
(potential bug) and thus interpreted as a single character wildcard, and
for some reason the presence of any wildcard causes Jaybird to append a
%... making it retrieve the columns for all three tables instead of just
TEST_TABLE (other potential bug).

--
Mark Rotteveel