I have found a wired behavior from the Button Particles. In the Editor all looks fine and work great but in the Frontend or Postings the Buttons Particles jumps out of the Buttons.
Here some Screens:
Pro Builder View:
Posting on Frontend:
Link for Testing
Have you fixed it? It works for me. (Chrome).
Looks good to me as well. Let us know if you’re still seeing anything unusual here. Thanks!
Its solved with Beta 5. Maybe a wired Browsercache issue… Thx for checking! 
Great to hear that! Thanks for letting me know.