New Funk Firm Achromat Warped


I just got this mat for my SL-1200G and one side is warped. The mat comes with double sided adhesive discs to secure the mat to the platter. However, the adhesive is not able to hold the warped side down. Just wondering if anyone else has had this problem. I purchased it from Music Direct, I will contact them tomorrow.

ericsch
Hi! 
Was the replacement mat ok?
Just asking cos I went through 3 and they were all warped (5mm thickness ones). However I flattened the last one a bit and have been using it as it really helps in tightening up the bass on my thorens. However the warp when combined with slightly warped records can become audible . I have also measured a negative effect with adjust+ software. The warp worsens speed variations quite considerably. So my problem is that  I really like the bass and added clarity the mat gives but the warp is becoming annoying. Are there any other mats I could try that are not as expensive but yield similar results?

The replacement mat was also warped. Music Direct accepted the second return and we gave up. I now use a Herbies Mat as a did before on my Rega P3-24.
The warps must have something to do with the newer mats?  I have (2) of the 3mm and (2) of the 5mm, all of which are perfectly flat.  I bought these years ago and have never had a problem.