Dynamic next/continue button

Hi all!

I have an e-learning with Correct/Incorrect slide layers per slide.
On there is some feedback and a "Continue" button.
Then, in a second scene, there is the results slide and some disclaimer stuff.
Along side that, I have 2 variables:
progress: displays current slide number (minus title slides, intro slides, etc etc)
NumberOfQuestions: displays total number of questions

On the Correct/Incorrect slide layer I have a trigger set up as following:
Jump to slide Next Slide
When user clicks Continue
If progress ≠ variable NumberOfQuestions
Else: Jump to slide 2.1 Results

It works great on all slides EXCEPT on the last slide.
The evaluation (IF...) is correct yet it doesn't jump to the results slide.
I've tried changing it to standard " jump to 2.1 result if IF = true, otherwise go to next slide"  but that breaks the (visual?) flow in the scene.

However; if I put a slide after the last slide (blank slide), it works?!!?

I don't understand what is going on or what I'm overlooking.

Can someone enlighten me???

Thanks in advanced and kind regards!

***EDIT***
I've tried to re-create a miniature version of the file/problem.
Check out the attachment.