The meters we get to use for home testing are not as accurate as we would like (+/-15%) it's quite normal to get different results on different meters. It's also common to get two different readings on the same meter, using a different strip on the same spot of blood.
Having said that though the readings should all fall within the same range, if your true level was 6, for example, then any meter no matter what make should give you results somewhere between 5 - 7 to comply with the +/- 15% standard
The results from your new meter seem to be way outside the accepted standard, I would not be able to trust it and would be contacting the manufacturer for a replacement or a refund.