First Response Digital Question Mark, Then THREE Lines?

EDIT: If you’re not going to advise and instead just tell me it’s invalid, please do not comment.

Hello ladies. I have been TTC with PCOS for about 6 months after two losses with my current SO. We are on Letrazole, seems to be working. Around day 15-16 I had egg white cm (pic in comments), which I have never had before. It wasn’t a constant flow, just came out in a big chunk and was then super moist for a few days, but not like egg white. I’m now around 15-16 DPO, I’m 2 days late and I’m peeing every 5-20 minutes. I usually can hold it for a while but I have been on the brink of messing myself constantly for a few days now. Hubby suggested taking the last digital we had. We have been using FRER but they have been giving me a million false positives, I’ll post pics of those as well. We decided to order some pregmate and clinical guard since we have never had that issue with those. They were coming later on the day so we went ahead and took the digital. After about 5-6 minutes of blinking, we got a question mark. When googling they said open it up. (PS I am aware that’s a no no but it doesn’t make the strip invalid, I called FR and they said it reads like a normal strip test. One line for negative and two for positive)

Long story short, we open it and understand why the test was confused because so are we! We have not one, not two, but THREE lines. I’m wondering if anyone else has had this happen before and what it could mean. We tested with the strips when they arrived later in the day but both were negative, very confusing.

We’re hoping I don’t have another issue going on causing the frequent urination, that’s kind of what we were trying to figure out.

PS, if you are going to comment that it’s invalid or I’m not supposed to open them, please refrain. That’s not what I’m asking, just trying to get advice from people who may have a similar experience.