How did you generate the different panels? If they weren't created via the mechanically welded element command, I don't believe you can get what you want.
Update your welded parts list, go back into your MEP, and you should have the right quantities.
If you're wondering why you have multiple lines for the same length, it's simply that these blades have machining features. Solidworks differentiates between them.
There is, to my knowledge, no way to group profiles according to a field in a welded parts list.
I managed to open your file: everything is normal!
I think that what you have a problem with are lines 2 and 3 of your table. In fact, SW differentiates bodies based on their length but also on any changes in the topology (the cutouts in your case).
It may be possible to modify the table either at the drawing level (line merging) or by removing the automatic update of the mechanically welded parts list (it is then possible to move a body from one file to another).