I have the updated versions of both the ShareThis plugin and WordPress, and the ShareThis plugin is interfering with my permalinks selection.
Below is what I shared with HostGator, who checked on the issue for me.
"The problem I am experiencing is that the URL of my post does not end with the post name even though the correct permalink setting is selected (see attached). Previously all my posts ended with the post name, but two days ago this changed and I have not been able to make the setting work.
This is the link being posted:
But it should only be: http://lilisnotes.com/thursday-motivation-23/"
I will keep the plugin deactivated until the issue is resolved.