Here are some pictures that show what I'm talking about

Hey there,
What version of backslot are you using?

I suspect you're on an older version of Backslot.
Please update to the latest version and things will be scaled correctly, as seen below:

I tried downloading the latest version for 1.18.2(what I'm playing on) and nothing changed, is there a later version for 1.18.2? The latest I could find is 1.6.2.

Oh, I see - I believe the mod author of Backslot changed the way these weapons scale, but didn't backport the change to their 1.18 version.
I may find the time to fix this in Simply Swords, but I think it would be ideal if Backslot had the scaling work consistently across all their release versions.