Yep that sounds like what is going on. Some reflectors just don’t have a lot of clearance around the base. Something that usually works for me is to add a flat piece of copper tape or solder wick material to basically make a very low profile contact. This allows you to then make your solder blob a little farther out from the center.

There is a messy example in a 20mm MCPCB. You might have to add some tape or something to the shelf area to avoid any shorts.