Sharepoint loading default form instead of PowerApps modified one

So I edited my List form to use one that I edited through PowerApps. Has worked perfectly on all my list for a year now.

However, since last week, when user (and even now, me) clicks on "New element", Sharepoint will load the old form. Moreover, sometimes Sharepoint loads a new version of Lists, I rather the old one, because this error only happens when the new one loads.

How can this be fixed?