Form editor issue

Hello !

I have an issue with the form editor.

When I customize my register form and when I save it, the plugin take a loooooong time to transfer the data at the server (1-2 minutes). When the transfer is done, my customization doesn’t exist, like the plugin do a reset. I don’t understand why.
All the other functionnalities of the plugin work, it’s just the form editor.

Can you help me?

https://ww.wp.xz.cn/plugins/pie-register/