I thought I got a plant when I did the third upgrade on the office, but I did it on another family I had and the weed isn't there. Here's a pic, I'm using Sally MG's glowing collectible mod but it's been around longer than I installed it, I can't pick it or anything so I just thought it was suppose to be there

That's a very strange place for a weed. Is it possible that somehow a peep was carrying one through the house and was interrupted?

I guess it could be possible but I never see them carry weeds through the office.

That happened to me but I could pick it up again. Actually dig it up. lol