This is because the BOM creator you used does not support a “.” in the references. You have at least one reference that contains a “.”.
So either give this symbol a different reference (Might be unfeasible) or use a different BOM creation script.
Have a look at the forum FAQ for details of how the BOM stuff works. How to create a bill of materials (BOM)?
At the end there is a list of possible third party BOM tools.
I tested KIBom by @SchrodingersGat and it works with such references. https://github.com/SchrodingersGat/KiBoM