Even if static compression is enabled for some reason response headers are not being sent with gzip encoding. I not sure what would cause that to happen.
However, you can try hosting all files as uncompressed. To do this, unzip any .gz files (e.g. *.js.gz or *.jz.mem.gz) and then change .html file to not reference any .gz files. Hopefully, that will fix your issue as cost of increased download times.
If REG.RU has on–fly compression enabled by default you may not notice any difference.