Which Browser? Do you have any add-ons or extension installed in that Browser. Also sometimes something additional is blocked by BPS Pro, but the primary functionality of whatever a plugin or theme is doing is not blocked. Example: a mobile device is retrieving image files, but that mobile device is also trying to do additional things with additional scripts that BPS Pro will block. Whatever those additional things are in those additional scripts are bad news if BPS Pro is blocking that. The point is image files are retrieved successfully and whatever additional “bad” things are trying to be done are not allowed/blocked.
FYI – mobile devices have become a favorite tool for hackers and spammers these days for all the obvious reasons – portability, flexibility, etc.