I've never had this issue (I also use OS 10.13.4 on both of my Macs), but in doing some searching, it is possible there is an issue with Permissions on the Trash "application". This link has a fix for it:
Note, though, that it was written 2 years ago. But permissions can still get out of whack, for various reasons. Make sure you have a recent backup first before you try it.
I've never had this issue (I also use OS 10.13.4 on both of my Macs), but in doing some searching, it is possible there is an issue with Permissions on the Trash "application". This link has a fix for it:
Note, though, that it was written 2 years ago. But permissions can still get out of whack, for various reasons. Make sure you have a recent backup first before you try it.
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