Posted by Gary S on Mar 29, 2021; 11:35pm
URL: https://forum.librecad.org/Librecad-keeps-adding-blocks-to-block-list-tp5715315p5720487.html

The additional blocks may have been created at this step:

   "The new drawing of the roofing was created by making a a copy of the roofed view and deleting all elements of the drawing that was not the roof covering."

Copying blocks within a drawing will create additional blocks in the block list.

As Dellus mentioned., the latest version of LC does make it easier to remove multiple blocks.  Have you considered compiling it?  I'm using LC v2.2.0rc2 that I compiled on Debian Bullseye.  The new and improved features makes it a worthwhile effort...