No popup in App Store that app is bigger than 100 MB
Tried to download both the Askers application and an another application over 100MB. Neither I nor the Asker did get the pop-up about downloading large apps over cellular.

It looks like it is a temporary issue with the AppStore.
My recommendation is that you try again tomorrow or the day after that and see if the issue have fixed it self. If not, then you can continue further investigation in the issue.