Never used the kits. But it definitely seems like there is an issue with the process. Hopefully someone will chime in and help you out so we can get some true readings.
I had this same problem happen to me and the seller assured me the product was legit. I had that exact same yellow color and everything. To be honest I dont trust this test. On amazon a guy even commented saying that he had walgreen testosterone and it showed us as "fake" too. Id use labmax or just inject and get bloods bro.