My 4K-Ts don’t activate on critters usually
Does your normally activate on critters?
Did the Intrusion zone pick it up?
Also tripwires can be tricky. There is a 3D element to them where the deer could have literally walked “under” that rule.
Try doing your zig zag horizontally vs vertical. Start with a line left to right the entire length of your area of concern right at the curb edge.
Them cross back right to left and spread the lines out about 3ft or so working back towards the house.