Quick BHO Q

Purging my 2nd batch ever now of my own grown stuff and had a quick Q, in my process I extract about 10g's directly into a mason jar in water bath through a tube and then when about half is purged off after about 60 seconds I pour what's left into a shot glass and use that for the remainder of the purge....my Q is when I transfer am I losing oil in the mason jar? I'm unsure about the oil/butane liquid stability i guess? When I transfer is all of it leaving together or is some oil getting stuck behind? I noticed this 2nd time beacause I used the same jar there is almost like a shatter looking film in a couple small spots..and possibly the same this time..I just dislike scraping a big pyrex and also I get less butane in the air by having it kinda dipped in the jar.. Hope this makes sense thanks..
 
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