This is an issue with the FinOps application webpage reloading the same page after a new window popup has caused an interaction which requires a refresh of the base webpage.
You can change the view settings after approval as follows:
Change the Group By selection to something else, then click Refresh
Change the Group By selection back to it's original value, then click Refresh again
This should refresh the page back to your original grouping
We do have this registered as an issue with our developers against the current release of the Financials Operations application (1.8.0 as at the time of writing)