Recently, I tried to automatically convert the encoding of a WOFF font to WOFF2. On Windows 8 and Mac OS 10.12, WOFF2 does pretty close between Chrome 60, IE 11, and Firefox 55. WOFF2 has a very bad effect on Chrome in Windows 7, but it seems that WOFF does not suffer from the same problems. WOFF2 on Firefox looks right.
Mac OS 10.12, Safari

Windows 7, Chrome 60

Please note that buttons 1 and 7 are slightly shifted.
-webkit-font-smoothing is set to smooth.
Is this a known issue?
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