Layer shows, but take too much on doing it

Hi, people.

I have a simulation that (that, yes: I have modified a bit). In this particular slide of the simulation (it's attached), I have put three hotspots on the calendar icons, so the learner can press them in any order.

You may notice that the hotspots are now red. I don't know why. I didn't want to upload the entire simulation, so I copied that one slide into a new document and it colored the hotspots red. But, when previewed, the slide behaves the same way, so it shouldn't matter (I think).

In order to try it properly click the calendar icon on the right:

Calendar 1

click day 28

Calendar 2

click month menu, choose "diciembre", then pick day 31

Calendar 3

click month menu, choose "septiembre", then pick day 30

After having been clicked, every button should display the date in the text field. They do, but not inmediatly.

I tryed by shortining the timeline, but it wasn't it.

I used a similar (if not identic) method for some other slide and it works fine, so I am a bit lost now.