I received an official response saying you cannot have more than 5 each of the tokens at a time. Check your factory info and use up tokens to speed up. Then you can you can click and retrieve more of your floaters. Worked for me.
If you have less than 5 tokens for any color you can collect the tokens, but 5 or more you can't collect them until you use them up.
As you get higher into the game you receive tokens as prizes in war, challenges etc and it's not uncommon to have LOTS of tokens! Currently I have about 25 of each color of token..I use them for speed ups when I need lots of items made or especially when doing Mayors Challenge for long production items or when I'm in a hurry!
I'm Level 32, compete in war and the Mayors Challenge. I use my tokens often and win probably more than I use. I have many buildings that put out gold, silver and bronze tokens but I have not collected any in months now because I can't!
It's good to have the buildings that have the tokens for you to use and if you can dedicate the time to get silver or gold tokens that's even better. Bronze are ok but really, they only speed up production by half vs 4x or 12x speed with silver and gold.
Hope that helps!
