Especially noticeable with small, slow enemies. The default settings are set up so that the trigger radius of the landmine is larger than its AOE size. This means that something like a medium biter can just take a stroll through a mine field, because it's not fast/large enough to move into the explosions it causes. it would be nice if the AOE size adjusted the trigger radius as well.

Hey Thanks for your message, Could you perhaps show the situation in a screenshot.

Also, there a re some settings available you might like to change for your needs.

https://www.youtube.com/watch?v=Fu66eFTx4sg
You can see the biters just walk through the landmines here, detonating multiple of them without dying to the explosions.

Thanks again for reporting, this should now be resolved. let me know if there are still issues.