Cloudflare breaks css?

Question

cloudflare

Connected https via cloudflare, and in css this appeared in some lines

UNUSED.h1 .small,
UNUSED.h2 .small,
UNUSED.h3 .small,
UNUSED.h4 .small,
UNUSED.h5 .small,
UNUSED.h6 .small {
  font-weight: normal;
  line-height: 1;
  color: #777777;
}

instead of this

.h1 .small,
.h2 .small,
.h3 .small,
.h4 .small,
.h5 .small,
.h6 .small {
  font-weight: normal;
  line-height: 1;
  color: #777777;
}

I connect this not for the first time, and this has not happened yet.
how to disable this game?