The commonly used morning after pills are levonorgestrel
containing pills which can come as a single tab of 1.5mg or 2tabs of 0.75mg. Your pack must have been the second one.
The cause you had bleeding again after contact could be a side effect of the pill as it is a hormonal
tablet and side effects like spotting, irregular bleeding, unexpected vaginal bleeding can occur after their intake.
Besides one reson might be that your periods were not yet over and one or two day gap sometimes occur during the usual 7 day flow. So you must have thought that your periods are over when they were actually not.