This is pretty strange: the second time I search, when I scroll, the secondary pane starts showing the results of the previous search, while the primary pane still shows the results of the current search. Here's what I did (twice, so it's reproducible):
Open VULGATE text.
Set the lower pane to show ESVS.
Search for "(Belial,Beliar)". Results are displayed as expected.
Search for "seba". Results appear as expected.
DA61757D-5834-4B4E-810B-C3D2068079AA.jpeg 258.8KB 0 downloads
Scroll upper pane. The lower pane now switches to shows the verses corresponding to the previous search (for "(Belial,Beliar)"). The upper pane continues to show the results of the current search.
367567AF-5172-4717-A606-E5097895289B.jpeg 259.31KB 0 downloads