for some reason in the past few weeks / month, i can't really recall when this happened but now actions are stored in some tab storage and then replayed upon activating the tab.
to replicate this, simply open up a few torn tabs and do not interact with the first few whilst doing attacks / hosps / various other actions in the second or third tab. then when you switch back to the first tab you will see a replay of all those actions happen in quick succession. you can even see it cycle through multiple chains.
this appears to happen on all pages