Sorry for not following the format, but i believe i have included all the information on the original form..
So i (Photoave12) am making a store in meep (yes, another one), and i am trying to label things with armor stands to keep it organized. however, theres this one section of my store where it seems like all the armor stands keep disappearing.
the first time it happened was about 2 days ago (8/6/16-ish) and i thought nothing of it, so i replaced the lost stand and placed another one in place of the lost one (which was about where the "test" stand is in the screenshot) as well as the "building blocks" one. 
after the second one disappeared, i checked the "building blocks" one, which i had placed at almost the same time and it was still there. after replacing that second one i modrequed and @Deljikho began trying to find out what happened. (this is when the test one was placed (it had all the same settings as the ones i had lost))



some time after the test one disappeared, i noticed that two armor stands that i had placed on an upper balcony (the /vote notes section) had disappeared but not the third (there should be one just above the center of each rowlineof chests)...

this is when i started to think that it had to do with the plot... so i checked plot perms...

(these perms were on every plot). Other plots aren't having this issue...
now i have lost at least 4 armor stands and have no idea why.
note: the armor stands appear fine immediately after i place them, however they only disappear after i teleport away (usually to the wild) maybe this has something to do with clearlag or some kind of server process that un-loads the world from memory or something? (my inner tech just spilled out there, sry if you don't understand that)