Konami lost the complete source code for Silent Hill 2 and 3, leaving the team behind the Silent Hill HD Collection to work with unfinished versions of the games.
Senior associate producer Tomm Hulett revealed the unfortunate loss for a 1UP feature on HD remasters.
"We got all the source code that Konami had on file - which it turns out wasn't the final release version of the games," he said.
"So during debug we didn't just have to deal with the expected 'porting' bugs, but also had to squash some bugs that the original team obviously removed prior to release, but we'd never seen before."
Despite the criticisms the remakes have received, things could have been a lot worse.
"A lot of assets such as textures and sound had to be taken out of the compiled game, and that brings with it a host of unique issues, especially taken on top of the tricky coding workarounds at play in the original games. We certainly had our hands full. I think at one point Heather was blue," the producer added.