Keyboard selection (Bug)

[Lido]

Please see the attached file.

I select (Shift +Down Arrow) text files t3 and t4, then move them with F6 to another location.
Use again Shift +Down Arrow on t5, and the selection is not t5+t6 text files, but from Folder F2 up to t6.
Can this be fixed? Checked on several computers, same strange selection result.

Thank you in advance,
Lido