Positive cheap test followed by three negative tests, could it be evaporation?

[Linenspring]

So yday I took a morrisons cheapy that looks like a positive? Pictured below. I then took x1 morrisons test and x2 CB digital, week one, and all 3 came negative. Is that maybe an evap line/leaked urine in test or something?

Oh and i am 18dpo!

Updating this in case someone stumbles on it in future - I actually got my period. It was a false positive morrison’s test! We aren’t ttc but if we were, I would have been devastated. They shouldn’t sell faulty tests!!

I’ve had a couple of false positives on these Morrisons tests also. They’re crap!