[GNC] CSV matching produces duplicates?

[Elmar]

Version 4.4 from flatpak on linux mint 19.3  ( I think my sig needs to 
be fixed, but I misremember how to do that)

Since my OFX import to my bank seems now broken, I have been reduced to 
CSV imports.  And I find that the matcher does not match worth beans, 
producing duplicates of tranasctions that in fact DO match within the 
one month window.  Is this a know problem?  Is there a way to tune the 
matcher better? - Elmar