Merged data Issue

Hi,

Just a week back I got done with running all merge modules for merging the existing PhpBB forum with MyBB. I see a lot of inconsistency in the data for all tables
Like in all tables the title columns are not complete rather they're as follows:

Actual data in PhpBB table: "This is a sample data mentioned here." 
Data showing up in MyBB tables after merge: "This is a sample ..." 

Noted both source and destination DB used is Postgres DB's.

Also after this, I see the dependant module data isn't mapped to any table properly even if it was existing in Phpbb tables
i.e. Forums table does not have user information stored for migrated records, the thread table doesn't have forum or user information stored in it, and so on. And because of this the forum details are not showing up properly on index.php

There's a lot of inconsistency and issues I'm facing at this moment. When I tried to run the merge module again, after selecting Phpbb on the merge screen, I saw the following issue, while I could not find any file db_.php in forums/inc/db

Warning [2] require_once(C:\xampp\htdocs\forums/inc/db_.php): failed to open stream: No such file or directory - Line: 161 - File: C:\xampp\htdocs\forums\merge\resources\class_converter.php PHP 7.4.21 (WINNT)
File

Fatal error: require_once(): Failed opening required 'C:\xampp\htdocs\forums/inc/db_.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\forums\merge\resources\class_converter.php on line 161





Please if someone can help me with this, it'll be really really nice. Many many thanks in advance. I need this to get resolved as soon as possible.