Clearblue Digital OPK, smiley face symbol hasnt gone off display

[NatoPMT]

Using Clearblue digital opks for the first time this month...I got a flashing smiley face yesterday, then today on CD11 (usually ov on CD13 or 14) I have a solid smiley face

However, the display still shows the smiley face... 5 hours after I did the test. Is it broken? Can i trust today's reading?

Ta

 

[Keds195]

Hi Hun the solid smiley will stay on for 2days. X