Hi, sorry it took me a few days to get back to you. I have not seen any objects fall through the floor.
My video card is very old--an AMD Radeon R7 200 Series. Also, I did a video capture of the glitch. The top of the screen is a little cut off but you should be able to see what's going on. I try to drag the field card onto the field but it just slides back into my hand. Halfway through the video I switched the game settings from "drag to place card" to "click to place card" and the results are the same.
Video may be seen here: https://www.screencast.com/t/JFWMW8lntv2
Please let me know if the link doesn't work.
Thanks!
-Jennifer