I found with my last pg that horizantal line was - - - like but the vertical line that makes the cross was solid.
I remmber at the time discussiong it with my friend and we thought that maybe the horizantal line was a test line to show the test working IYSWIM as i think you got the horizantal one on a negative test too??
Hope this makes sense...was it the same line for you or all of the lines that were - - - not_??
It was definitely accurate though as i was pg at the time, m/c since but trying again soon and planning to test Friday if i have no AF by then!!