My apologies for the delay... I've been pretty busy with work lately.
Well, I can't seem to reproduce the issue you are having. All the schemes seem to work just as they're supposed to in all of my tests.
The only thing I can really offer at this point is to have me take a look at it myself. You could send me a link to the site where you're having the issue, and your WordPress login details, and I'd be happy to try it out to see if I can figure out the issue. :)
I can understand if you don't trust me, but that is all I can really think of. I can't seem to reproduce the issue on any of my setups, so I don't think there is much more I can do, unless you could have me take a look directly.
If you would be ok with me taking a look, you can send the details to my email at firstname.lastname@example.org and I'd be happy to take a look. I would definitely not mess with anything else on your site and my intentions are only to help as much as I can. I do WordPress support for a living, so I do this kind of stuff every day.
Anyway, sorry again for the delay. I hope to hear from you again.
Thanks for using my plugin. :)