This might not be the OP's problem, but a list might show up as 0kb in the profile's list of Favorites systems, though not in Windows Explorer.
I selected "Edit Favorites", then when prompted to pick one from the list, I selected New
That then takes me to the Favorites Edit screen.
Instead of adding a system to the new list, I simply saved it.
Now, when I look, in a Profile, at the Favorites lists available, the one I just created shows a size of zero.,
View attachment 195169
As you already noted, the file the OP attached earlier in this thread does have systems, sites, & conventional channels.
Check the active profile in Sentinel, and make sure that the file you want is set to be both downloaded and monitored. It may be that you have two lists with similar names. The one that shows 0kb in the list of Favorites in your profile may be the "blank" list that you are loading. Either set it not to download & not to monitor, or simply delete it to avoid future problems.
You may have loaded your "blank" plus the list you attached earlier, In the scanner's menu, make sure that the list you really intended to use is set to be scanned.