It seems that Lavastorm must be bugged where it thinks you're swimming the whole time you're in the zone. I was trying to run to SolB (and then learned I can't get to it with just running to it and have to wait until later level *sniff*) and when I was running through the zone I started getting tons of swimming skillups. I most definitely was not swimming through lava, and even when standing still I was still getting the skillups.
This is quite obviously a bug, in the time I was in LS I went from 100 skill to 230 skill just running to solb and being popped back to the nek zone when I tried to zone into solb.
Thanks,
Insedeel