Block calendar caption

Hi,

I'm not sure of the behaviour the block calendar should have... When I click onto the next arrow, I get a full page view of the month. I was expecting that the mini calendar changed the month and didn't change the page (refreshing or without refreshing, it doesn't matter in this issue in concrete).

I've been working on the code to personalize some features, and I don't know if I messed this functionality out or it does what it is supposed to do.
If I've messed something up, can anyone give me a clue where to find the problem? Thank you very much!!