I think it might just have been my confusion then and not a bug? I wasn't able to complete the first level after 5+ tries.
Viewing post in Dead Raiders jam comments
We will do some more testing then. As for traps disappearing - there is a progress bar appearing next to them when you place them and the progress bar goes down indicating that the traps have a timer on them and they expire. This is also indicated with a hourglass icon on their tooltip. Now I added the hourglass icon next to their progress bar to make it more clear. Not sure if this is what you mean though. There is one or 2 traps that isnt visible after placing them because they come from the ceiling and are invisible until a raider enters their area. Assuming that this is what you meant, I added a 3d indicator to the placed traps now that marks their tile as occupied (only traps do this) so you can see more clearly that something got placed there. These update will be included in the post gamejam patch. Thanks for your input!