Dear Steph,
Thank you for reporting this issue, and please accept our apologies for the delayed response. I have collected the information and sent it out to our R&D group for analysis. I'm not sure I'll have an answer for you before your exam (which, as far as I understand, is today afternoon) but I assure you we will work on this.
I know this answer does not help you to determine if you are ready for your exam. However, many our customers who took and passed their PMI-ACP exam reported that they scored around 75% on our simulator and noticed that the questions on our simulator are similar to the real exam. Therefore, based on your statistics, I believe you are in good shape.
On behalf of our team, I wish you best of luck on your exam and will be happy to see you back with the lessons learned that start with "I passed!"
Thanks again for making us aware of this and helping us improve our products for all our customers.