Very exaggerated! Seriously 5 out is a dodgy one. They've replaced for less. It took me a while to adjust to their quirks and it is nigh on miraculous if you get one scanning at the same level as the strips. As I mentioned above applying and waiting 2 days before you activate lets it settle and the scan is closer. Abbott don't confess to this but it was Scott-c that explained to me that when you think about it you are inserting a foreign body into yourself in the form of the filament so your body is going to go after it. Let it settle and it gets used to it. As you get towards the end that's when you start to get bigger gaps when presumably whatever they put on the filament starts to break down. 2 under seems fairly normal at that stage. I always check before bed with a jab and my FBG. After the jab I scan at 10 mins after and 15 mins to try to get an idea of where it is in relation to the finger pricks. Usually they are the only ones I do so long as I am getting a consistent gap. I used to jab pre breakfast but the last 2 weeks I've been fasting 24 hrs most days and only eating dinner to get my weight loss moving again. The knock on effect had been I've had BG'S in the low 4's but Libre had me down in the 2's so that was enough to get me on extra jabs. Again once I see a consistent gap I just adjust for it. Why did I stick with it? My fingers were a mess. I had to get really strict with food as I was having some weird highs so I was testing before every meal and at 1, 2 and 3 hrs after. Libre took away that need. I can see at a glance what a food is doing to me. Another thing I've noticed is if you have a rapid rise or fall then you get a bigger gap between jab and scan but again usually around the 2 mark. To be honest I don't want to be without them now. Once I get the measure from the jab and 10/15 min scan I'm happy to stick with the scan for the rest of the day usually and just adjust so if I was scanning at 4 I was saying fine that's about 4.6 and don't worry about it unless it come with a downward arrow as well! Your one though is dodgy - tell Abbott about the readings and get it replaced. You can get weird readings but not that weird.