Dollar tree preg test fiasco

Ladies! I've just spend the past 4 days trying to solve this insane mystery. For the past 4 days I've been getting faint positives with the dollar tree pregnancy test. I wanted to double check with other brands and they all came back negative. I know that dollar tree tests are more sensitive so I assumed it was just too early. 
Just for fun, I had my husband take a dollar tree came out just as positive as mine! So then, I had my sister and brother in-law both take tests... Both came out positive! Not sure why this would happen as I've never had a problem before with this brand. Has anyone heard of this happening? Wondering if they changed the manufacturer or something? 
Ps- I did not mistakenly buy an ovulation test.
Below is a pic of my husband and brother in-law's tests.