Various problems with various orchids

Here is what I noticed recently and I don't like it:

1. White spots on several paphiopedilums leaves.
Micranthum:

Malipoense:

Jackii(really close up):


2. Something (or someone) eats the leaves on my Masd. decumana. It originally came with one hole in the leaf, but now there are more holes:


Back view:


3. Masdevallia constricta has lots of small round black dots on the leaves:



All these orchids have two things in common:
a) they all live in the basement - a bit cooler environment, some sun very early in the morning;
b) they all were sprayed with Safers Endall miticide twice little while ago.
But there are over 10 more paphs and at least 3 more masdies with same two things that are perfectly fine.

Any idea?