Sup,
Ever since 1.24 Claymore Mines seem to bug occasionally where they are not placed properly after the placing animation. You cannot detonate them and not even pick them back up. After trying for a while I noticed that it pretty much always bugs when placing near base building structures such as a fence, while far away from any it seemed to work always (doubt it's coincidence).
Examples:
https://www.youtube.com/watch?v=VRWC_nKJrqg
https://www.youtube.com/watch?v=8KKRpDQ8f-U
Cheers,
Sten