Have you mounted the camera inside or outside ?, which glass is the IR reflecting off ?.
On most IR illuminated cameras the unit can be opened up and the incorporated IR array unplugged altogether, as most use an LDR to switch on the LEDs putting tape over it may cause the IRs to turn on in lower light conditions and make the problem even worse. The ideal scenario is to provide another light source for the camera by means of remotely located IR illumination or flood lights away from the camera itself.