I noticed that when my troops were poisoned or hit with acid by spiders, the marker that appeared over their info card sometimes told me what the countdown was before it could be launched again from the spider (eg - 3 turns with Acid 1), or how long it would last when "fresh" (Acid 2 and poison 3, iirc). Neither of these indicators would update as turns passed. This leads to not knowing when my troops would stop taking damage. Probably just an incorrect variable (string) call for the display.
As a secondary issue, when targeting *with* acid 1 (my sovereign was a Beast Lord and tamed one of those annoying Rock Spiders), damage would show as zero even though the acid would indeed cause damage to the target. Not sure what the issue is there, as the damage was usually more than 1 so it wasn't a rounding issue.