As the title says, when I use the command \bigl[, the result looks like the result corresponding to \bigl\lfloor. Compare: $\bigl[$ vs $\bigl\lfloor$. However after zooming a little ("Ctrl" + "+" on my Foxy browser) the result looks correct. I work at a 1920x1080, 22'' screen, so this is hardly a problem related to my screen. Perhaps a browser problem? I doubt, too.
Any advice will be appreciated. Thanks.