Hi @darkstaride1
I have had problems like this with the iPhone 7 and 8 charging port replacements. You should check the charging port connector on the logic board for physical damage, then ensure that the alignment is perfect so all the pins make a solid connection.
The best way to ensure the connector alignment is to connect the cable to the logic board, wrap it around underneath the board and tape it against the bottom side. Once you’ve done this, you can put the logic board into the iPhone frame and stick the charging port down where it needs to be to preserve the alignment. After that, you can continue to install the charging port as normal.
Hopefully that will resolve your problem