The first is that, if the player applies a good entanglement (high damage per turn) then keeps firing at the target, they can end up re-applying a worse entanglement that deals less damage, while not a bug per se this kind of sucks since it basically disincentivises continuing to shoot at the target, as you can actually end up dealing less damage if you replace a 200DPT entanglement with a 50DPT entanglement. It would be preferable if a new entanglement was only applied if it has higher damage per turn than an existing entanglement.
The second is that entanglement damage doesn't seem to take the damage the target resisted into account:
Here I hit the strongman for 141 damage, with him resisting 76, my Acid pistols's entanglement deals 212% of damage dealt over 2 turns, that should be 106% per turn or in this case 149, however we're dealing 230 per turn, divided by 1.06 this is almost exactly 217, which is the damage I dealt before the Strongman's resistance was taken into account.