Yeah, I'm pretty sure, the flags are pretty similar when you see them from that tiny resolution, and I don't really zoom set on my browser in by 1000%.
Slovakia's flag:
Slovenia's flag:
Note how they both have similar color patterns and a seal located on the left side of the flag. With the tiny resolution of the flags on the image "country" thing, and me not reading her location, it can be very easy to confuse things.