Hi Nicole,

indeed extra Custom CSS is needed:

.leaflet-marker-icon.leaflet-zoom-animated.leaflet-interactive {
  max-height: 34px !important;
  height: 34px !important;}

Use it or inside Template Custom CSS area or inside that Page in Custom CSS area (more in SPPB documenation).

I added it and it didn't make a difference. I cleared all the caches as well.

Errata, my mistake,

must be 34px not 64px

LOOK UP ^