Trillium UniClic won't click/sit properly

Attempting to install some engineering hardwood in a room I'm finishing, never put down a hardwood floor before so opted for what is supposed to be easiest. However when trying to clic the floor together, it doesn't seem to fully click, and when I lay it down it sits on a bit of an angle (join enough rows together and it's got a bow in it.) The instructions might as well not exist for all the help they are, tried watching videos but of course those all seems to show perfect installs where everything just falls into place. floor is well acclimated as it's for a project I started in the summer but have not gotten to until now. Only have two out of 11 cases open so I'm not against taking them back and suffering the small loss and going with a different product. Should note, this is my first attempt at engineered/hardwood flooring so I'm sure there is probably something I'm overlooking. But when I install, I put in the first row (piece of cake!) but then the second row, starting piece by piece, developes the angle I was mentioning. Try tapping it into place with a gargbage piece of the flooring (I picked a 1ft piece and designated it my tapping block) but nothing seems to correct the problem. Thanks for any help. Not being familiar with the product one item comes to mind. floor is well acclimated as it's for a project I started in the summer but have not gotten to until now. Only have two out of 11 cases open so I'm not against taking them back and suffering the small loss and going with a different product. Does this mean you've had a few rows down since the summer? It could be the exposed flooring has gained moisture and created a tighter fit with the newer pieces. HardwoodGuy I had a few pieces dry fit just to show my wife what it would look like, but this was only a few pieces, I started again with a different case that I opened the day I went to put it in, so it hadn't been sitting or anything. Since my troubles I looked upthe reviews from other people on various websites who were less tehn impressed with the particular floor type I had, so I took it all back. Thanks

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