Blow off time and liquid disappeared

[tmtz1]

Brewing A Kviek IPA and everything was going well. Fermented at 95* as per recipe. Finished fermenting, hit my numbers so I removed heat and allowed temp to free fall in garage (cool days) which it got to 80 degrees. As I was moving the bucket to the mini fridge to finish off, I noticed the blowoff bottle with star San was down to the very bottom. There had been about 3 quarters of it in it. Was it sucked back as it cooled?? I've never only had this happen during cold crashing.

Thoughts?

 

[day_trippr]

Unless you have wild animals that enjoy sipping Star San, suck-back seems most likely...

 

[tmtz1]

I figured, just worried cause never saw it outside of cold crashing. I'm worried about any oxygen that may have gotten in there.