Why would a database work on one server, and only partially on another? - mariadb

Question

Sorry if this is a newbie question. I have been searching and can't seem to figure this out.
I am trying to move a PHP webapp from Plesk, to RunCloud. Both are hosted on a Digital Ocean server.
I exported the database from Plesk, and imported it into RunCloud. After updating the config, it only partially works. Some of the tasks read data, a few seem to write, but a majority just break it.
The strange thing is, if I point the config file to the Plesk server, the app works great using it as a remote database.
Here is from the PHPMyAdmin. The only thing that looks fishy is UNIX, vs TCP. But I cannot find a way to change RunCloud to UNIX.
I would copy the errors, but they are across the board. Any ideas? Thank you so much!
PHPMyAdmin Plesk Server:
Server: Localhost via UNIX socket
Server type: MariaDB
Server connection: SSL is not being used Documentation
Server version: 10.1.48-MariaDB-0ubuntu0.18.04.1 - Ubuntu 18.04
Protocol version: 10
User: prod#localhost
Server charset: UTF-8 Unicode (utf8mb4)
From RunCloud Server:
Server: 127.0.0.1 via TCP/IP
Server type: MariaDB
Server connection: SSL is not being used Documentation
Server version: 10.4.21-MariaDB-1:10.4.21+maria~focal-log - mariadb.org binary distribution
Protocol version: 10
User: prod#localhost
Server charset: UTF-8 Unicode (utf8)

Answer 1

As a newbie, I learned that 10.1 and 10.4 were rather different. I then went through each error to see if I could find the change on the MariaDB update guide (which is great). Somehow, I came across this post: error code 1292 incorrect date value mysql. It was the zero date. I just added the line in my.cnf that it suggested. Fixed!!!