Component Help

This isn't really a question on how to change anything, I am just looking to see if anyone knows why sometimes the dates on entries are bold and sometimes they're not? Or is this just me? At first I thought maybe to differentiate even and odd-numbered days, but that doesn't seem to be the case...I also thought maybe entries that had comments were bolded, but that wasn't it either.

Example of what I mean:

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Anyway like I said, I'm not looking to change this or anything, I don't really care, I was just wondering why it does that. Thanks for any explanations.

I used the tutorial to customize the title bar and add an extra component under it and customized it a little to make it look more like a 'real' entry, along with printing a little square below it to indicate the start of the real entries. But now I have this weird space between the stuff I created (using the tutorial) and the rest of my entries. (Screenshot here.) It's weird, and I can't figure out what is causing it. It wasn't there before I tweaked the code, but I have no idea what could be causing it either because most of what I added was to add text and images and stuff.

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Help...?