No flooring is waterproof. Water may not affect it if vinyl, but were water to spill or flood in any decent quantity it will still get to the subfloor. It would have to all be taken up, washed, allowed to dry and after the subfloor is all dried out, reinstalled. Afr far as the end joint go it does look a little odd, almost like someone drove them together with a mallet.

Thank you very much! It is unfortunate that it is marketed as waterproof! :)

Yah...the sales people are told to 'sell it' as water proof (each plank by itself is unaffected by water...). As millworkman points out, even a porcelain tile floor will cause issues once the water reaches the wall/subfloor.

As for the edges you are seeing, some times this happens. Vinyl is delicate. It does NOT like being slammed together. vinyl takes a 'softly softly' approach which is why it is more expensive to install than laminate. The short edges show this more because they are SHORTER and the edges can be HARDER to click together. Many installers (especially if it is their first effort with the manufacturer ordered by the homeowner) will put extra effort to getting the short edges to go together (we see this with cork flooring especially). That causes a little bit extra stress (pinching like a pie crust) at the short edge.

Is there a fix? Nope. Is it worth removing and doing it again? Nope. And for this reason the long edges should run in the same direction of the light source (like you see in the picture). It is better to see the short edges doing this (back lighting shows the lippage) rather than the LONG edges doing this (that is SUPER annoying).