Strange 'bowing' gap between horizontal laminate planks?

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Hi all, we have laid laminate in multiple houses before and this is the first time we've run into such an issue. The planks have been stored indoors at room temperature for months before we actually started the project so there are no worries with acclimatisation.

When attempting to connect two planks, there is almost like a 'dip' or curve in the horizontal connection in the middle. The beginning of the connection is fine, then the gap rapidly grows, then closes up again towards the other end. We cannot figure what is causing this. The flooring is Kronospan Original Supernatural and has good reviews, it uses some '1clic 2go pure' system. We have never had this issue even with cheaper lower quality laminate.

The other planks are properly aligned, all other sides are fine, there are no weird gaps between the side connections or the other planks, everything is equal and distributed. We have tried using laminate knocking blocks/tools. It all seems very inconsistent, some planks will present the bowing, others will not, but there is a lot that won't connect properly.

I feel like we are missing something vital that we've possibly overlooked. Is the rest of the laminate pulling/pushing on it somehow due to alignment issues? The images of the two planks together are just for demonstration, we are using the usual alternating line/pattern. It is being laid on perfectly straight floors with the recommended underlay by Kronospan. The house is relatively modern and the subfloor is perfect. The planks themselves lie flat and flush with the floor, there is no sag.

Even when we have just two standalone two planks together, isolated and detached from the rest of the laminate, the issue still presents. Could this be manufacturer faults or storage faults? A few batches of errant laminate? We've spent days trying new things and it just doesn't make sense. It was only today that we tried a test sample isolated from the other laminate did we realise it might not be down to us but a manufacturer issue.

Here is a short video of a sample of laminate highlighting the issue


This is a highly exaggerated representation of the issue

IMG_9928.jpg


I assumed if it was storage issues causing it, the planks would look more like this below, which isn't our case

JfmfTCs.jpeg



Thank you
 
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Consistent failure of that nature across the boards suggests a faulty batch, assuming storage was not on end.
 

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