Hi, I did 2 FRER tests (both from same box) and got positives on both. Then did 2 more (from another box) but they went like this, I followed instructions of 5 seconds and didn't leave it in the sample.....has anyone seen this before please? The bottom one is example of the fainter of the two positives which was a pink line, it's just not shown up too well on the photo. Thanks.