Hi LSHMND,
It seems that the recurring invoice window is acting differently in your end. I tried replicating it on my end and I seem to not have the same issue. Additionally, there is no reported instance of an issue similar to what you described. I recommend trying to recreate the same task in a different computer to see if the same issue appears. As it is potentially connected to the browser/computers settings.
Let us know the results of testing and or if you need any further help with this.
Thanks,
Genreve