u/Paperthinplasticbag

In June I took a baseline before starting Tesa. In July I check 6 weeks in, 87 to 185. Good expected result, Tesa seemed to be working. Then I added 100 mcg of IPA after that. Checked 4 weeks later and it went down to 137. Not expected. I’m most inclined to just think it’s random variation, but wanted to see if anyone else had ideas on what could cause this.