I have seen that many times, in many different places. PAPI's that would make you cross the threshold at 80 feet, or that would show 4 reds while on the glide slope (as in your case)...
Basically, below minimum you may disregard the G/S and PAPI and visually go for the threshold, crossing it at 50' above. If you are landing in an runway fitted for widebodies you may see that keeping two reds and two whites will leave you high on the threshold (followed by a long landing), and if the ILS is not certified for autoland, following the G/S down to touchdown may not be the best. Below minima it is you, the threshold, and the airplane. The rest is just for guidance.
I have been doing this for a long while and never got a problem.