Conflicts with EDD discounts

I just downloaded the plugin to use on my two sites hire.techiemamma.com and projects.techiemamma.com

I had two folks needing to purchase on hire and with a discount but with the plugin enabled every time I tested with the discount it threw an error of invalid. I disabled just share login and the code worked. I am happy to throw this on a staging site so you can see it replicated. Just let me know.

The page I need help with: [log in to see the link]