I have 5 Dp traps the 1st 3 sets all traps with bait missing had coons in them or the bait was still there. The last few sets I have not caught anything in the Dp's but have caught coons in the live trap. The bait is getting stolen but the trap isn't going off. I tried to set 1 off with a stick and it was extremely hard to set off. They sit out in the weather when they are set but stay inside when not in use. I haven't tried the ping pong ball yet but they are getting set around feeders so I don't believe mice or stealing all the bait. I have been using corn, small marshmallows, big marshmallows, hard cat food. They do not look rusty and were purchased November 2023, wondering is the marshmallows sugar making them sticky so I cleaned them with hot water and still having the same issue. Any ideas what I could do to free the trigger up?

Does the trigger move freely without the spring being compressed ? I've had some that the trigger had some corrosion where it met the retaining pin. I doused it with fish oil and worked it back and forth until it moved freely. However, don't underestimate the mouse problem.

I haven't tried the trigger without being compressed but it makes since. I will try that this weekend hopefully and let you know. Thanks for the advice.

I use mini marshmallows and then wedge a big marshmallow in the top. Mice can't get them out and coons have no problem removing them.

Most likely its a mouse

Mini marshmallows work great, if you don't have mini, chop up the big ones.....

Caught this one with chopped up, big marshmallows......

https://imgur.com/a/AdSNwjX

Finally was able to set some traps out this weekend. 2 sets and managed to trap 3 coons.
I lubed the traps with used pnut oil. It was all I had. All traps went off great. I will try the golf ball on the top of the trap when I am able to get some.
Thanks for the help.

Go on Facebook and look up Wildman's Hammer Time. It's a darn good bait for DP's.