Fdk. After Dark: Very sappy

[Zabeta]

Hi everyone,

My Fdk. After Dark is growing well and has big leaves. However, I've noticed in the past couple days that there's a TON of sap on the bottom of the leaves, not just along the edges, but in some cases all over the underside. I've been wiping it off, and unfortunately I didn't think to take a picture.

Could this be a sign of a pest of some sort? Or for those who've had this orchid, is it normal for them to be extra sappy?

Any advice would be appreciated!