Advice..

So i took a digital test last night (left test strip) and clearly negative.

I took a digital today and came up not pregnant but than when i looked again it switched to pregnant like 2 hours later.. I thought it was wrong so i opened it and this is what it said (right test strip)

I know you're not supposed to open them but i opened the one from last night to compare.. Is this normal? Has this happened to anyone else?