Two pink lines, one light, one dark?

For what it's worth, up until yesterday the chart was showing ovulation way off, on CD 18 where the fainter pink line is. I actually think ovuation was CD 21 because the .5 was actually a .45, not unusual for pre-O temps for me.

Any insights? And any explanations for EW after ovulation? I usually have a clearer dry-up than this. Thanks.