Its called warpage and yeah its an issue with wood look depending on brand, because of its shape. Based on a forum discussion I have bookmarked (but can't seem to link thanks to the spam filter on gardenweb) you could have minimized it by going to wider groutlines but it's probably a bit late for that now and that may not be the look you were looking for.

Fwiw your photo looks lovely to me.

Quoted from discussion
"Rectified means the length and width are exact. Not mentioned is the warpage. The tile standards allow .5% to fall within the standard grade which means a warpage of 1/8" is allowed on a 24" tile. That doesn't mean that Roca doesn't adhere to a higher standard. The picture on their website shows no lippage or warpage, but just to be sure, you should spot check your tile with a straightedge."

If not set in a stack pattern, then large format tile really needs to be installed with a slightly wider grout line than most people actually want. Or else, they need to find a tiler with experience with an old fashioned mud bed. That's the only way to keep the lippage to a minimum when using large format tile that always has a bit of warpage to it. Always.

In a few weeks you probably won't even notice the lippage.

Thanks, so I guess I shouldn't be mad at my tile-man. We did want tight grout lines.

I notice it everytime I move a chair. I guess I'll get used to it.

Thanks again,
Jane

Stonetech,

Real good answer.

Thanks, all. Stonetech, I appreciate your expertise and wonder if my tile person knew that. I doubt it. I mentioned to him that I have seen this type of tile in restaurants without the problem. He said the tile might have been layed in mud.

I find it unreasonable that this tile should have edges sticking up as a normal occurrence. Didn't make sense to me.

Thank you,
Jane

Had wood look tile installed in my kitchen last year. Can't move a chair on it. Have tried every kind of slider possible on the bottom of the chairs. They keep getting caught on the rise of the tiles next to each other. Were you able to solve your issue?

Unfortunately, no. It's annoying but we live with it.

Wow, old post. I forgot all about it.

Thanks for your reply. Looks like we are in the same boat. :(

"Were you able to solve your issue?"

Not as issue you can solve without tearing it out and starting over with the correct offset pattern. Unfortunately they tell you the recommended offsets for a reason but usually don't explain what the issues will be if you don't follow there recommendations.

When someone chooses a random offset pattern as the OP did, shouldn't it be expected that some of the tiles won't fall into the "recommended offset" range? IMO, it's somewhat of a trade-off if you want the random pattern and smaller grout lines.