HA!!! Glad I finally searched for this on here! My Taylor test strips did the same thing. That's why I postponed adding borates to my pool. I had never added borates to the pool but just bought the house a year before. Never suspected the previous owner added borates (assumption based on the leftover supply of pool store chems) but wanted to test prior to adding boric acid, just to be sure. I got my Taylor borate test strips from a local pool store the same day I got my boric acid shippment. When I used the test strips it color matched for 100! Boy was I disappointed, and forced myself to wait until I could find out whether or not the pool actually had borates. I had read about the drop test on TFP and ordered the BTB and mannitol, but work etc intervened until this year and I didn't get around to adding borates. But now... Just did drop test (finally) and yep, pool actually has zero borates. So, now, finally a year later, gonna add the boric acid!
Something definitely wrong with those test strips. Maybe was a bad batch or something, but now that I have the reagents for the drop test, that's what I'm going to use... fairly easy to do.