Hi Kora, thank you so much for your comment and bug reports!
You're our hero again with the seaweed bonus coins upgrades bug report! I just found the bug and fixed it, and it will be patched later today! :D
The tiny movement to collect the other seaweed after one is collected is a bug I'm still working on, and hopefully it will also be added to today's patch.
Thanks again, Kora, and please come and play again later today when I'll upload the patch (I'll make a devlog to trigger a notification :) )