SGR versions bigger than the complete one

It's since some releases that I noticed that the SGR release files are bigger than the standard one.

How can it be?
```
Iosevka.ttc        404737552
SGr-Iosevka.ttc    515986972

IosevkaCurlySlab.ttc        423058808
SGr-IosevkaCurlySlab.ttc    513223080

```
