Hi just a question regarding an in date pot of testing strips. I have tested with the control solution and the range on the pot says 7 - 9.1. The problem I have is that it has pinged up at 9.3 each time. The testing solution is in date, so are the strips funky? I have tested 3 times time with the solution on three metres and its still saying 9.3 each time. What do I do? Thank xx