The EWCM marked on the chart will confuse FF and that's probably why it has put your O day where it has. Can you create a custom entry for pre-seed and mark it that way instead? I can't remember if you need a VIP membership to create custom entries or not?

Do you normally get +opk? I have been getting slow rises since early last year and find I have to rely on the opk to pinpoint O.

I'm sorry to say I really don't know when or if you may have O'd. I hope it becomes clearer soon.