jCarousel displaying small/cropped image?

Hi,
I've set up jCarousel on my site and I've come across something weird. Sometimes when I look at a page that has a carousel on it, it only shows me a little bit of the first image (as seen in the top part of the attached screenshot). If I reload the page, then it's fine and it shows me all the photos just like it should (the bottom part of the screenshot). It's not consistent -- I had to click around a bunch before I found a page to take a screenshot of.

Any ideas what could cause this? I don't see any js errors when it happens, and reloading always makes the page come up correctly. I notice that the right-scroll arrow doesn't show up when it happens, so maybe that is a clue to what's happening?

(Note that the left arrow isn't in the image at all -- that's not a bug; I made the "grayed out" part of the arrow image completely blank, so an arrow only shows up when it's clickable.)

Thanks for any insight! I can't imagine this is any kind of error in this module, but I figured someone here might have seen this before.