Hmm weird one regarding it asking you to withdraw BALN......must be a glitch/bug. Can you upload a pic online and send the link (using something like https://imgbb.com/ ?
As for the sICX/ICX pool itself; it should be working fine.
Your ICX will eventually get turned into sICX as this pool essentially works as a queue. When it reaches your ICX it will be converted to sICX and you won't receive BALN rewards for it.
Referring to it as a pool is a little confusing in comparison to the other two as it works completely differently.
During your time in this queue you receive BALN which offsets your loss of ICX staking rewards but eventually it'll get converted to sICX once your turn comes around.
You can then leave this sICX as it is and it'll accrue staking rewards but you'll earn no BALN. Alternatively you could add it to the sICX/bnUSD pool or unstake it. For unstaking you've the option of unstaking instantly at a 1% fee or doing it the standard process (no fee). Please note that the standard process can take a max of 7 days but I found it only took a few hours (it depends on the demand of sICX on the platform at the time; the more demand the faster your unstaking will be)