With all due respect, I saw this coming
Move away while you can. Wappler Docker is opinionated and I believe the Wappler team lacks the touch of real production environments. I suggest you use shared hosting, or if you don't like shared hosting you can setup CloudPanel on your VPS (this is what I did).
The SFTP deployment is insanely slow but they'll improve this in Wappler 7, or so I hope...
Edit:
Every time you change your target settings you're subject to this "bug"